diff --git a/X10D/src/Collections/ArrayExtensions.cs b/X10D/src/Collections/ArrayExtensions.cs
index 053d27d..7b6d5ee 100644
--- a/X10D/src/Collections/ArrayExtensions.cs
+++ b/X10D/src/Collections/ArrayExtensions.cs
@@ -17,10 +17,7 @@ public static class ArrayExtensions
     [Pure]
     public static IReadOnlyCollection<T> AsReadOnly<T>(this T[] array)
     {
-        if (array is null)
-        {
-            throw new ArgumentNullException(nameof(array));
-        }
+        ArgumentNullException.ThrowIfNull(array);
 
         return Array.AsReadOnly(array);
     }
@@ -45,10 +42,7 @@ public static class ArrayExtensions
     /// <exception cref="ArgumentNullException"><paramref name="array" /> is <see langword="null" />.</exception>
     public static void Clear<T>(this T?[] array, Range range)
     {
-        if (array is null)
-        {
-            throw new ArgumentNullException(nameof(array));
-        }
+        ArgumentNullException.ThrowIfNull(array);
 
         int index = range.Start.Value;
         int end = range.End.Value;
@@ -77,10 +71,7 @@ public static class ArrayExtensions
     /// </exception>
     public static void Clear<T>(this T?[] array, int index, int length)
     {
-        if (array is null)
-        {
-            throw new ArgumentNullException(nameof(array));
-        }
+        ArgumentNullException.ThrowIfNull(array);
 
         if (length == 0 || array.Length == 0)
         {
diff --git a/X10D/src/Collections/BoolListExtensions.cs b/X10D/src/Collections/BoolListExtensions.cs
index 365778a..d2b8991 100644
--- a/X10D/src/Collections/BoolListExtensions.cs
+++ b/X10D/src/Collections/BoolListExtensions.cs
@@ -18,10 +18,7 @@ public static class BoolListExtensions
     [Pure]
     public static byte PackByte(this IReadOnlyList<bool> source)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         if (source.Count > 8)
         {
@@ -48,10 +45,7 @@ public static class BoolListExtensions
     [Pure]
     public static short PackInt16(this IReadOnlyList<bool> source)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         if (source.Count > 16)
         {
@@ -78,10 +72,7 @@ public static class BoolListExtensions
     [Pure]
     public static int PackInt32(this IReadOnlyList<bool> source)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         if (source.Count > 32)
         {
@@ -108,10 +99,7 @@ public static class BoolListExtensions
     [Pure]
     public static long PackInt64(this IReadOnlyList<bool> source)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         if (source.Count > 64)
         {
diff --git a/X10D/src/Collections/DictionaryExtensions.cs b/X10D/src/Collections/DictionaryExtensions.cs
index fe0db27..2abef8a 100644
--- a/X10D/src/Collections/DictionaryExtensions.cs
+++ b/X10D/src/Collections/DictionaryExtensions.cs
@@ -34,15 +34,8 @@ public static class DictionaryExtensions
         Func<TKey, TValue, TValue> updateValueFactory)
         where TKey : notnull
     {
-        if (dictionary is null)
-        {
-            throw new ArgumentNullException(nameof(dictionary));
-        }
-
-        if (updateValueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(updateValueFactory));
-        }
+        ArgumentNullException.ThrowIfNull(dictionary);
+        ArgumentNullException.ThrowIfNull(updateValueFactory);
 
         if (dictionary.ContainsKey(key))
         {
@@ -84,20 +77,9 @@ public static class DictionaryExtensions
         Func<TKey, TValue> addValueFactory, Func<TKey, TValue, TValue> updateValueFactory)
         where TKey : notnull
     {
-        if (dictionary is null)
-        {
-            throw new ArgumentNullException(nameof(dictionary));
-        }
-
-        if (addValueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(addValueFactory));
-        }
-
-        if (updateValueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(updateValueFactory));
-        }
+        ArgumentNullException.ThrowIfNull(dictionary);
+        ArgumentNullException.ThrowIfNull(addValueFactory);
+        ArgumentNullException.ThrowIfNull(updateValueFactory);
 
         if (dictionary.ContainsKey(key))
         {
@@ -145,20 +127,9 @@ public static class DictionaryExtensions
         Func<TKey, TArg, TValue> addValueFactory, Func<TKey, TValue, TArg, TValue> updateValueFactory, TArg factoryArgument)
         where TKey : notnull
     {
-        if (dictionary is null)
-        {
-            throw new ArgumentNullException(nameof(dictionary));
-        }
-
-        if (addValueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(addValueFactory));
-        }
-
-        if (updateValueFactory is null)
-        {
-            throw new ArgumentNullException(nameof(updateValueFactory));
-        }
+        ArgumentNullException.ThrowIfNull(dictionary);
+        ArgumentNullException.ThrowIfNull(addValueFactory);
+        ArgumentNullException.ThrowIfNull(updateValueFactory);
 
         if (dictionary.ContainsKey(key))
         {
@@ -184,10 +155,7 @@ public static class DictionaryExtensions
     [Pure]
     public static string ToConnectionString<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         static string SanitizeValue(string? value)
         {
@@ -227,15 +195,8 @@ public static class DictionaryExtensions
     public static string ToConnectionString<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source,
         Func<TValue, string?> selector)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
-
-        if (selector is null)
-        {
-            throw new ArgumentNullException(nameof(selector));
-        }
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentNullException.ThrowIfNull(selector);
 
         static string SanitizeValue(string? value)
         {
@@ -281,20 +242,9 @@ public static class DictionaryExtensions
         Func<TKey, string> keySelector, Func<TValue, string?> valueSelector)
         where TKey : notnull
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
-
-        if (keySelector is null)
-        {
-            throw new ArgumentNullException(nameof(keySelector));
-        }
-
-        if (valueSelector is null)
-        {
-            throw new ArgumentNullException(nameof(valueSelector));
-        }
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentNullException.ThrowIfNull(keySelector);
+        ArgumentNullException.ThrowIfNull(valueSelector);
 
         static string SanitizeValue(string? value)
         {
@@ -326,10 +276,7 @@ public static class DictionaryExtensions
     public static string ToGetParameters<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source)
         where TKey : notnull
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         static string GetQueryParameter(KeyValuePair<TKey, TValue> pair)
         {
@@ -361,15 +308,8 @@ public static class DictionaryExtensions
         Func<TValue, string?> selector)
         where TKey : notnull
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
-
-        if (selector is null)
-        {
-            throw new ArgumentNullException(nameof(selector));
-        }
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentNullException.ThrowIfNull(selector);
 
         // can't static here because of 'selector' parameter
         string GetQueryParameter(KeyValuePair<TKey, TValue> pair)
@@ -407,20 +347,9 @@ public static class DictionaryExtensions
         Func<TKey, string> keySelector, Func<TValue, string?> valueSelector)
         where TKey : notnull
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
-
-        if (keySelector is null)
-        {
-            throw new ArgumentNullException(nameof(keySelector));
-        }
-
-        if (valueSelector is null)
-        {
-            throw new ArgumentNullException(nameof(valueSelector));
-        }
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentNullException.ThrowIfNull(keySelector);
+        ArgumentNullException.ThrowIfNull(valueSelector);
 
         // can't static here because of selector parameters
         string GetQueryParameter(KeyValuePair<TKey, TValue> pair)
diff --git a/X10D/src/Collections/EnumerableExtensions.cs b/X10D/src/Collections/EnumerableExtensions.cs
index 46e9126..fa44da6 100644
--- a/X10D/src/Collections/EnumerableExtensions.cs
+++ b/X10D/src/Collections/EnumerableExtensions.cs
@@ -134,9 +134,13 @@ public static class EnumerableExtensions
     /// <typeparam name="T">The element type.</typeparam>
     /// <param name="source">The <see cref="IEnumerable{T}" /> to shuffle.</param>
     /// <param name="random">Optional. The <see cref="System.Random" /> instance to use for the shuffling.</param>
+    /// <returns>The shuffled collection.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [Pure]
     public static IReadOnlyCollection<T> Shuffled<T>(this IEnumerable<T> source, Random? random = null)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         var list = new List<T>(source);
         list.Shuffle(random);
         return list.AsReadOnly();
diff --git a/X10D/src/Collections/ListExtensions.cs b/X10D/src/Collections/ListExtensions.cs
index d943395..de3c0ab 100644
--- a/X10D/src/Collections/ListExtensions.cs
+++ b/X10D/src/Collections/ListExtensions.cs
@@ -17,10 +17,7 @@ public static class ListExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static void Fill<T>(this IList<T> source, T value)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         for (var i = 0; i < source.Count; i++)
         {
@@ -47,10 +44,7 @@ public static class ListExtensions
     /// </exception>
     public static void Fill<T>(this IList<T> source, T value, int startIndex, int count)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         if (startIndex < 0)
         {
@@ -98,10 +92,7 @@ public static class ListExtensions
     [Pure]
     public static T Random<T>(this IReadOnlyList<T> source, Random? random = null)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         random ??= System.Random.Shared;
         return random.NextFrom(source);
@@ -119,10 +110,7 @@ public static class ListExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static void Shuffle<T>(this IList<T> source, Random? random = null)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         random ??= System.Random.Shared;
 
diff --git a/X10D/src/Core/RandomExtensions.cs b/X10D/src/Core/RandomExtensions.cs
index a2c4ac9..c075fd3 100644
--- a/X10D/src/Core/RandomExtensions.cs
+++ b/X10D/src/Core/RandomExtensions.cs
@@ -21,10 +21,7 @@ public static class RandomExtensions
     public static T Next<T>(this Random random)
         where T : struct, Enum
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         var values = Enum.GetValues(typeof(T));
         return (T)values.GetValue(random.Next(values.Length))!;
@@ -44,10 +41,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static bool NextBoolean(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         return random.NextDouble() >= 0.5;
     }
@@ -67,10 +61,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentOutOfRangeException"><paramref name="maxValue" /> is less than 0.</exception>
     public static double NextDouble(this Random random, double maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         if (maxValue < 0)
         {
@@ -99,10 +90,7 @@ public static class RandomExtensions
     /// </exception>
     public static double NextDouble(this Random random, double minValue, double maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         if (maxValue < minValue)
         {
@@ -133,15 +121,8 @@ public static class RandomExtensions
     /// </example>
     public static T NextFrom<T>(this Random random, IEnumerable<T> source)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
-
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(random);
+        ArgumentNullException.ThrowIfNull(source);
 
         if (source is T[] array)
         {
@@ -166,10 +147,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static byte NextByte(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         return random.NextByte(byte.MaxValue);
     }
@@ -190,10 +168,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static byte NextByte(this Random random, byte maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         return random.NextByte(0, maxValue);
     }
@@ -219,10 +194,7 @@ public static class RandomExtensions
     /// </exception>
     public static byte NextByte(this Random random, byte minValue, byte maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         return (byte)random.Next(minValue, maxValue);
     }
@@ -237,10 +209,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static short NextInt16(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         return random.NextInt16(short.MaxValue);
     }
@@ -262,10 +231,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentOutOfRangeException"><paramref name="maxValue" /> is less than 0.</exception>
     public static short NextInt16(this Random random, short maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         if (maxValue < 0)
         {
@@ -296,10 +262,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static short NextInt16(this Random random, short minValue, short maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         return (short)random.Next(minValue, maxValue);
     }
@@ -319,10 +282,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentException"><paramref name="maxValue" /> is less than 0.</exception>
     public static float NextSingle(this Random random, float maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         if (maxValue < 0)
         {
@@ -351,10 +311,7 @@ public static class RandomExtensions
     /// </exception>
     public static float NextSingle(this Random random, float minValue, float maxValue)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         if (maxValue < minValue)
         {
@@ -382,15 +339,8 @@ public static class RandomExtensions
     /// <exception cref="ArgumentOutOfRangeException"><paramref name="length" /> is less than 0.</exception>
     public static string NextString(this Random random, IReadOnlyList<char> source, int length)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
-
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(random);
+        ArgumentNullException.ThrowIfNull(source);
 
         if (length < 0)
         {
diff --git a/X10D/src/Drawing/RandomExtensions.cs b/X10D/src/Drawing/RandomExtensions.cs
index 32cf1e8..e121cb4 100644
--- a/X10D/src/Drawing/RandomExtensions.cs
+++ b/X10D/src/Drawing/RandomExtensions.cs
@@ -15,10 +15,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static Color NextColorRgb(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         int rgb = random.Next();
         return Color.FromArgb(0xFF, (byte)(rgb >> 16 & 0xFF), (byte)(rgb >> 8 & 0xFF), (byte)(rgb & 0xFF));
@@ -32,10 +29,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static Color NextColorArgb(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         int argb = random.Next();
         return Color.FromArgb(argb);
diff --git a/X10D/src/IO/FileInfoExtensions.cs b/X10D/src/IO/FileInfoExtensions.cs
index 272c99a..2b36120 100644
--- a/X10D/src/IO/FileInfoExtensions.cs
+++ b/X10D/src/IO/FileInfoExtensions.cs
@@ -16,7 +16,7 @@ public static class FileInfoExtensions
     ///     The type of the <see cref="HashAlgorithm" /> whose <see cref="HashAlgorithm.ComputeHash(Stream)" /> is to be used for
     ///     computing the hash.
     /// </typeparam>
-    /// <returns>The hash of <paramref name="stream" /> represented as an array of bytes.</returns>
+    /// <returns>The hash of <paramref name="value" /> represented as an array of bytes.</returns>
     /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     /// <exception cref="FileNotFoundException">The specified file was not found.</exception>
     /// <exception cref="IOException">The opened file stream cannot be read.</exception>
@@ -29,10 +29,7 @@ public static class FileInfoExtensions
     public static byte[] GetHash<T>(this FileInfo value)
         where T : HashAlgorithm
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         using FileStream stream = value.OpenRead();
         return stream.GetHash<T>();
@@ -65,10 +62,7 @@ public static class FileInfoExtensions
     public static bool TryWriteHash<T>(this FileInfo value, Span<byte> destination, out int bytesWritten)
         where T : HashAlgorithm
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         using FileStream stream = value.OpenRead();
         return stream.TryWriteHash<T>(destination, out bytesWritten);
diff --git a/X10D/src/IO/ListOfByteExtensions.cs b/X10D/src/IO/ListOfByteExtensions.cs
index dbec6e1..1c8cf39 100644
--- a/X10D/src/IO/ListOfByteExtensions.cs
+++ b/X10D/src/IO/ListOfByteExtensions.cs
@@ -19,10 +19,7 @@ public static class ListOfByteExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static string AsString(this IReadOnlyList<byte> source)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToString(source.ToArray());
     }
@@ -50,10 +47,7 @@ public static class ListOfByteExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static double ToDouble(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToDouble(source.ToArray(), startIndex);
     }
@@ -78,10 +72,7 @@ public static class ListOfByteExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static short ToInt16(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToInt16(source.ToArray(), startIndex);
     }
@@ -106,10 +97,7 @@ public static class ListOfByteExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static int ToInt32(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToInt32(source.ToArray(), startIndex);
     }
@@ -134,10 +122,7 @@ public static class ListOfByteExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static long ToInt64(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToInt64(source.ToArray(), startIndex);
     }
@@ -164,10 +149,7 @@ public static class ListOfByteExtensions
     /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static float ToSingle(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToSingle(source.ToArray(), startIndex);
     }
@@ -185,15 +167,8 @@ public static class ListOfByteExtensions
     /// </exception>
     public static string ToString(this IReadOnlyList<byte> source, Encoding encoding)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
-
-        if (encoding is null)
-        {
-            throw new ArgumentNullException(nameof(encoding));
-        }
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentNullException.ThrowIfNull(encoding);
 
         return encoding.GetString(source.ToArray());
     }
@@ -220,10 +195,7 @@ public static class ListOfByteExtensions
     [CLSCompliant(false)]
     public static ushort ToUInt16(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToUInt16(source.ToArray(), startIndex);
     }
@@ -250,10 +222,7 @@ public static class ListOfByteExtensions
     [CLSCompliant(false)]
     public static uint ToUInt32(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToUInt32(source.ToArray(), startIndex);
     }
@@ -280,10 +249,7 @@ public static class ListOfByteExtensions
     [CLSCompliant(false)]
     public static ulong ToUInt64(this IReadOnlyList<byte> source, int startIndex)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return BitConverter.ToUInt64(source.ToArray(), startIndex);
     }
diff --git a/X10D/src/IO/StreamExtensions.cs b/X10D/src/IO/StreamExtensions.cs
index ab353de..2aa70bc 100644
--- a/X10D/src/IO/StreamExtensions.cs
+++ b/X10D/src/IO/StreamExtensions.cs
@@ -504,10 +504,7 @@ public static class StreamExtensions
     /// <returns>The number of bytes written to the stream.</returns>
     public static int Write(this Stream stream, short value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -548,12 +545,10 @@ public static class StreamExtensions
     /// <param name="value">The four-byte signed integer to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     public static int Write(this Stream stream, int value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -581,6 +576,7 @@ public static class StreamExtensions
     /// <param name="stream">The stream to which the value should be written.</param>
     /// <param name="value">The eight-byte signed integer to write.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     public static int Write(this Stream stream, long value)
     {
         return stream.Write(value, DefaultEndianness);
@@ -594,12 +590,10 @@ public static class StreamExtensions
     /// <param name="value">The eight-byte signed integer to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     public static int Write(this Stream stream, long value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -627,6 +621,7 @@ public static class StreamExtensions
     /// <param name="stream">The stream to which the value should be written.</param>
     /// <param name="value">The two-byte unsigned integer to write.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static int Write(this Stream stream, ushort value)
     {
@@ -641,13 +636,11 @@ public static class StreamExtensions
     /// <param name="value">The two-byte unsigned integer to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static int Write(this Stream stream, ushort value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -675,6 +668,7 @@ public static class StreamExtensions
     /// <param name="stream">The stream to which the value should be written.</param>
     /// <param name="value">The four-byte unsigned integer to write.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static int Write(this Stream stream, uint value)
     {
@@ -689,13 +683,11 @@ public static class StreamExtensions
     /// <param name="value">The four-byte unsigned integer to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static int Write(this Stream stream, uint value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -723,6 +715,7 @@ public static class StreamExtensions
     /// <param name="stream">The stream to which the value should be written.</param>
     /// <param name="value">The eight-byte unsigned integer to write.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static int Write(this Stream stream, ulong value)
     {
@@ -737,13 +730,11 @@ public static class StreamExtensions
     /// <param name="value">The eight-byte signed integer to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static int Write(this Stream stream, ulong value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -772,12 +763,10 @@ public static class StreamExtensions
     /// <param name="value">The single-precision floating point value to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     public static int Write(this Stream stream, float value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -806,12 +795,10 @@ public static class StreamExtensions
     /// <param name="value">The double-precision floating point value to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     public static int Write(this Stream stream, double value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
@@ -840,12 +827,10 @@ public static class StreamExtensions
     /// <param name="value">The decimal value to write.</param>
     /// <param name="endianness">The endian encoding to use.</param>
     /// <returns>The number of bytes written to the stream.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="stream" /> is <see langword="null" />.</exception>
     public static int Write(this Stream stream, decimal value, Endianness endianness)
     {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
+        ArgumentNullException.ThrowIfNull(stream);
 
         if (!Enum.IsDefined(endianness))
         {
diff --git a/X10D/src/Linq/ByteExtensions.cs b/X10D/src/Linq/ByteExtensions.cs
index ee049ff..32a11f3 100644
--- a/X10D/src/Linq/ByteExtensions.cs
+++ b/X10D/src/Linq/ByteExtensions.cs
@@ -12,8 +12,11 @@ public static class ByteExtensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="byte" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static byte Product(this IEnumerable<byte> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate((byte)1, (current, value) => (byte)(current * value));
     }
 
@@ -22,9 +25,12 @@ public static class ByteExtensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="sbyte" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static sbyte Product(this IEnumerable<sbyte> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate((sbyte)1, (current, value) => (sbyte)(current * value));
     }
 
@@ -36,8 +42,11 @@ public static class ByteExtensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static byte Product<TSource>(this IEnumerable<TSource> source, Func<TSource, byte> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 
@@ -49,9 +58,12 @@ public static class ByteExtensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static sbyte Product<TSource>(this IEnumerable<TSource> source, Func<TSource, sbyte> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 
diff --git a/X10D/src/Linq/DecimalExtensions.cs b/X10D/src/Linq/DecimalExtensions.cs
index bcdf193..796a402 100644
--- a/X10D/src/Linq/DecimalExtensions.cs
+++ b/X10D/src/Linq/DecimalExtensions.cs
@@ -10,8 +10,11 @@ public static class DecimalExtensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="decimal" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static decimal Product(this IEnumerable<decimal> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1m, (current, value) => (current * value));
     }
 
@@ -23,8 +26,11 @@ public static class DecimalExtensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static decimal Product<TSource>(this IEnumerable<TSource> source, Func<TSource, decimal> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 }
diff --git a/X10D/src/Linq/DoubleExtensions.cs b/X10D/src/Linq/DoubleExtensions.cs
index 70ac1ca..e84343b 100644
--- a/X10D/src/Linq/DoubleExtensions.cs
+++ b/X10D/src/Linq/DoubleExtensions.cs
@@ -10,8 +10,11 @@ public static class DoubleExtensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="double" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static double Product(this IEnumerable<double> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1.0, (current, value) => (current * value));
     }
 
@@ -23,8 +26,11 @@ public static class DoubleExtensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static double Product<TSource>(this IEnumerable<TSource> source, Func<TSource, double> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 }
diff --git a/X10D/src/Linq/Int32Extensions.cs b/X10D/src/Linq/Int32Extensions.cs
index 923470e..fb636c8 100644
--- a/X10D/src/Linq/Int32Extensions.cs
+++ b/X10D/src/Linq/Int32Extensions.cs
@@ -12,8 +12,11 @@ public static class Int32Extensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="int" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static int Product(this IEnumerable<int> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1, (current, value) => current * value);
     }
 
@@ -22,9 +25,12 @@ public static class Int32Extensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="uint" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static uint Product(this IEnumerable<uint> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1u, (current, value) => current * value);
     }
 
@@ -36,8 +42,11 @@ public static class Int32Extensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static int Product<TSource>(this IEnumerable<TSource> source, Func<TSource, int> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 
@@ -49,9 +58,12 @@ public static class Int32Extensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static uint Product<TSource>(this IEnumerable<TSource> source, Func<TSource, uint> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 
diff --git a/X10D/src/Linq/Int64Extensions.cs b/X10D/src/Linq/Int64Extensions.cs
index 4870456..a29c3dc 100644
--- a/X10D/src/Linq/Int64Extensions.cs
+++ b/X10D/src/Linq/Int64Extensions.cs
@@ -12,8 +12,11 @@ public static class Int64Extensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="long" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static long Product(this IEnumerable<long> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1L, (current, value) => current * value);
     }
 
@@ -22,9 +25,12 @@ public static class Int64Extensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="ulong" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static ulong Product(this IEnumerable<ulong> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1UL, (current, value) => current * value);
     }
 
@@ -36,8 +42,11 @@ public static class Int64Extensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static long Product<TSource>(this IEnumerable<TSource> source, Func<TSource, long> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 
@@ -49,9 +58,12 @@ public static class Int64Extensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     [CLSCompliant(false)]
     public static ulong Product<TSource>(this IEnumerable<TSource> source, Func<TSource, ulong> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 
diff --git a/X10D/src/Linq/ReadOnlySpanExtensions.cs b/X10D/src/Linq/ReadOnlySpanExtensions.cs
index 3bbbfca..9c465ea 100644
--- a/X10D/src/Linq/ReadOnlySpanExtensions.cs
+++ b/X10D/src/Linq/ReadOnlySpanExtensions.cs
@@ -21,10 +21,7 @@ public static class ReadOnlySpanExtensions
     [Pure]
     public static bool All<TSource>(this ReadOnlySpan<TSource> source, Predicate<TSource> predicate)
     {
-        if (predicate is null)
-        {
-            throw new ArgumentNullException(nameof(predicate));
-        }
+        ArgumentNullException.ThrowIfNull(predicate);
 
         if (source.IsEmpty)
         {
@@ -56,10 +53,7 @@ public static class ReadOnlySpanExtensions
     [Pure]
     public static bool Any<TSource>(this ReadOnlySpan<TSource> source, Predicate<TSource> predicate)
     {
-        if (predicate is null)
-        {
-            throw new ArgumentNullException(nameof(predicate));
-        }
+        ArgumentNullException.ThrowIfNull(predicate);
 
         if (source.IsEmpty)
         {
diff --git a/X10D/src/Linq/SingleExtensions.cs b/X10D/src/Linq/SingleExtensions.cs
index 1797eaf..5cf9004 100644
--- a/X10D/src/Linq/SingleExtensions.cs
+++ b/X10D/src/Linq/SingleExtensions.cs
@@ -10,8 +10,11 @@ public static class SingleExtensions
     /// </summary>
     /// <param name="source">A sequence of <see cref="float" /> values that are used to calculate the product.</param>
     /// <returns>The product the values in the sequence.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static float Product(this IEnumerable<float> source)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Aggregate(1f, (current, value) => (current * value));
     }
 
@@ -23,8 +26,11 @@ public static class SingleExtensions
     /// <param name="selector">A transform function to apply to each element.</param>
     /// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
     /// <returns>The product of the projected values.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
     public static float Product<TSource>(this IEnumerable<TSource> source, Func<TSource, float> selector)
     {
+        ArgumentNullException.ThrowIfNull(source);
+
         return source.Select(selector).Product();
     }
 }
diff --git a/X10D/src/Linq/SpanExtensions.cs b/X10D/src/Linq/SpanExtensions.cs
index 6de52f3..4ae07c0 100644
--- a/X10D/src/Linq/SpanExtensions.cs
+++ b/X10D/src/Linq/SpanExtensions.cs
@@ -21,10 +21,7 @@ public static class SpanExtensions
     [Pure]
     public static bool All<TSource>(this Span<TSource> source, Predicate<TSource> predicate)
     {
-        if (predicate is null)
-        {
-            throw new ArgumentNullException(nameof(predicate));
-        }
+        ArgumentNullException.ThrowIfNull(predicate);
 
         if (source.IsEmpty)
         {
@@ -56,10 +53,7 @@ public static class SpanExtensions
     [Pure]
     public static bool Any<TSource>(this Span<TSource> source, Predicate<TSource> predicate)
     {
-        if (predicate is null)
-        {
-            throw new ArgumentNullException(nameof(predicate));
-        }
+        ArgumentNullException.ThrowIfNull(predicate);
 
         if (source.IsEmpty)
         {
diff --git a/X10D/src/Math/ComparableExtensions.cs b/X10D/src/Math/ComparableExtensions.cs
index 53bbc0e..211cfff 100644
--- a/X10D/src/Math/ComparableExtensions.cs
+++ b/X10D/src/Math/ComparableExtensions.cs
@@ -46,6 +46,7 @@ public static class ComparableExtensions
     /// //      True
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool Between<T1, T2, T3>(this T1 value, T2 lower, T3 upper,
@@ -54,10 +55,7 @@ public static class ComparableExtensions
         where T2 : IComparable<T3>
         where T3 : IComparable<T2>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         if (lower.GreaterThan(upper))
         {
@@ -102,11 +100,14 @@ public static class ComparableExtensions
     /// // clamped will be 20
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static T Clamp<T>(this T value, T lower, T upper)
         where T : IComparable<T>
     {
+        ArgumentNullException.ThrowIfNull(value);
+
         if (lower.GreaterThan(upper))
         {
             throw new ArgumentException(
@@ -138,15 +139,13 @@ public static class ComparableExtensions
     /// // result will be False
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool GreaterThan<T1, T2>(this T1 value, T2 other)
         where T1 : IComparable<T2>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return value.CompareTo(other) > 0;
     }
@@ -172,15 +171,13 @@ public static class ComparableExtensions
     /// // result will be False
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool GreaterThanOrEqualTo<T1, T2>(this T1 value, T2 other)
         where T1 : IComparable<T2>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return value.CompareTo(other) >= 0;
     }
@@ -206,15 +203,13 @@ public static class ComparableExtensions
     /// // result will be True
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool LessThan<T1, T2>(this T1 value, T2 other)
         where T1 : IComparable<T2>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return value.CompareTo(other) < 0;
     }
@@ -240,15 +235,13 @@ public static class ComparableExtensions
     /// // result will be True
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool LessThanOrEqualTo<T1, T2>(this T1 value, T2 other)
         where T1 : IComparable<T2>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return value.CompareTo(other) <= 0;
     }
@@ -273,15 +266,13 @@ public static class ComparableExtensions
     /// // max will be 10
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static T Max<T>(this T value, T other)
         where T : IComparable<T>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return value.GreaterThan(other) ? value : other;
     }
@@ -306,15 +297,13 @@ public static class ComparableExtensions
     /// // min will be 5
     /// </code>
     /// </example>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static T Min<T>(this T value, T other)
         where T : IComparable<T>
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return value.LessThan(other) ? value : other;
     }
diff --git a/X10D/src/Net/EndPointExtensions.cs b/X10D/src/Net/EndPointExtensions.cs
index b7ef2d7..81da9fc 100644
--- a/X10D/src/Net/EndPointExtensions.cs
+++ b/X10D/src/Net/EndPointExtensions.cs
@@ -25,10 +25,7 @@ public static class EndPointExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string GetHost(this EndPoint endPoint)
     {
-        if (endPoint is null)
-        {
-            throw new ArgumentNullException(nameof(endPoint));
-        }
+        ArgumentNullException.ThrowIfNull(endPoint);
 
         return endPoint switch
         {
@@ -54,10 +51,7 @@ public static class EndPointExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static int GetPort(this EndPoint endPoint)
     {
-        if (endPoint is null)
-        {
-            throw new ArgumentNullException(nameof(endPoint));
-        }
+        ArgumentNullException.ThrowIfNull(endPoint);
 
         return endPoint switch
         {
diff --git a/X10D/src/Net/IPAddressExtensions.cs b/X10D/src/Net/IPAddressExtensions.cs
index 0b8358d..9b2320b 100644
--- a/X10D/src/Net/IPAddressExtensions.cs
+++ b/X10D/src/Net/IPAddressExtensions.cs
@@ -17,10 +17,13 @@ public static class IPAddressExtensions
     /// <returns>
     ///     <see langword="true" /> if the specified IP address is a valid IPv4 address; otherwise, <see langword="false" />.
     /// </returns>
+    /// <exception cref="ArgumentNullException"><paramref name="address" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool IsIPv4(this IPAddress address)
     {
+        ArgumentNullException.ThrowIfNull(address);
+
         return address.AddressFamily == AddressFamily.InterNetwork;
     }
 
@@ -31,10 +34,13 @@ public static class IPAddressExtensions
     /// <returns>
     ///     <see langword="true" /> if the specified IP address is a valid IPv6 address; otherwise, <see langword="false" />.
     /// </returns>
+    /// <exception cref="ArgumentNullException"><paramref name="address" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool IsIPv6(this IPAddress address)
     {
+        ArgumentNullException.ThrowIfNull(address);
+
         return address.AddressFamily == AddressFamily.InterNetworkV6;
     }
 }
diff --git a/X10D/src/Numerics/RandomExtensions.cs b/X10D/src/Numerics/RandomExtensions.cs
index b89a5e2..ef94c17 100644
--- a/X10D/src/Numerics/RandomExtensions.cs
+++ b/X10D/src/Numerics/RandomExtensions.cs
@@ -19,10 +19,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static Quaternion NextRotation(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         int seed = random.Next();
         var seededRandom = new Random(seed);
@@ -42,10 +39,7 @@ public static class RandomExtensions
     /// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
     public static Quaternion NextRotationUniform(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         int seed = random.Next();
         var seededRandom = new Random(seed);
@@ -74,10 +68,7 @@ public static class RandomExtensions
     /// </returns>
     public static Vector2 NextUnitVector2(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         // no need to construct a seeded random here, since we only call Next once
 
@@ -98,10 +89,7 @@ public static class RandomExtensions
     /// </returns>
     public static Vector3 NextUnitVector3(this Random random)
     {
-        if (random is null)
-        {
-            throw new ArgumentNullException(nameof(random));
-        }
+        ArgumentNullException.ThrowIfNull(random);
 
         int seed = random.Next();
         var seededRandom = new Random(seed);
diff --git a/X10D/src/Reflection/MemberInfoExtensions.cs b/X10D/src/Reflection/MemberInfoExtensions.cs
index 9fd389e..826759c 100644
--- a/X10D/src/Reflection/MemberInfoExtensions.cs
+++ b/X10D/src/Reflection/MemberInfoExtensions.cs
@@ -25,10 +25,7 @@ public static class MemberInfoExtensions
     public static bool HasCustomAttribute<T>(this MemberInfo member)
         where T : Attribute
     {
-        if (member is null)
-        {
-            throw new ArgumentNullException(nameof(member));
-        }
+        ArgumentNullException.ThrowIfNull(member);
 
         return member.HasCustomAttribute(typeof(T));
     }
@@ -47,15 +44,8 @@ public static class MemberInfoExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool HasCustomAttribute(this MemberInfo member, Type attribute)
     {
-        if (member is null)
-        {
-            throw new ArgumentNullException(nameof(member));
-        }
-
-        if (attribute is null)
-        {
-            throw new ArgumentNullException(nameof(attribute));
-        }
+        ArgumentNullException.ThrowIfNull(member);
+        ArgumentNullException.ThrowIfNull(attribute);
 
         if (!attribute.Inherits<Attribute>())
         {
@@ -85,6 +75,9 @@ public static class MemberInfoExtensions
         Func<TAttribute, TReturn> selector)
         where TAttribute : Attribute
     {
+        ArgumentNullException.ThrowIfNull(member);
+        ArgumentNullException.ThrowIfNull(selector);
+
         return member.SelectFromCustomAttribute(selector, default);
     }
 
@@ -108,15 +101,8 @@ public static class MemberInfoExtensions
         Func<TAttribute, TReturn> selector, TReturn? defaultValue)
         where TAttribute : Attribute
     {
-        if (member is null)
-        {
-            throw new ArgumentNullException(nameof(member));
-        }
-
-        if (selector is null)
-        {
-            throw new ArgumentNullException(nameof(selector));
-        }
+        ArgumentNullException.ThrowIfNull(member);
+        ArgumentNullException.ThrowIfNull(selector);
 
         return member.GetCustomAttribute<TAttribute>() is { } attribute
             ? selector(attribute)
diff --git a/X10D/src/Reflection/TypeExtensions.cs b/X10D/src/Reflection/TypeExtensions.cs
index 301d1d2..001abc8 100644
--- a/X10D/src/Reflection/TypeExtensions.cs
+++ b/X10D/src/Reflection/TypeExtensions.cs
@@ -15,10 +15,13 @@ public static class TypeExtensions
     /// <param name="value">The type whose interface list to check.</param>
     /// <typeparam name="T">The interface type.</typeparam>
     /// <returns><see langword="true" /> if the current exists on the type; otherwise, <see langword="false" />.</returns>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool Implements<T>(this Type value)
     {
+        ArgumentNullException.ThrowIfNull(value);
+
         return value.Implements(typeof(T));
     }
 
@@ -28,19 +31,17 @@ public static class TypeExtensions
     /// <param name="value">The type whose interface list to check.</param>
     /// <param name="interfaceType">The interface type.</param>
     /// <returns><see langword="true" /> if the current exists on the type; otherwise, <see langword="false" />.</returns>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="value" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="interfaceType" /> is <see langword="null" />.</para>
+    /// </exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool Implements(this Type value, Type interfaceType)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
-
-        if (interfaceType is null)
-        {
-            throw new ArgumentNullException(nameof(interfaceType));
-        }
+        ArgumentNullException.ThrowIfNull(value);
+        ArgumentNullException.ThrowIfNull(interfaceType);
 
         if (!interfaceType.IsInterface)
         {
@@ -62,11 +63,15 @@ public static class TypeExtensions
     ///     <see langword="true" /> if the current type inherits <typeparamref name="T" />, or <see langword="false" />
     ///     otherwise.
     /// </returns>
+    /// <exception cref="ArgumentNullException"><paramref name="value" /> is <see langword="null" />.</exception>
+    /// <exception cref="ArgumentException"><paramref name="value" /> is not a class.</exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool Inherits<T>(this Type value)
         where T : class
     {
+        ArgumentNullException.ThrowIfNull(value);
+
         return value.Inherits(typeof(T));
     }
 
@@ -79,19 +84,22 @@ public static class TypeExtensions
     ///     <see langword="true" /> if the current type inherits <paramref name="type" />, or <see langword="false" />
     ///     otherwise.
     /// </returns>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="value" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="type" /> is <see langword="null" />.</para>
+    /// </exception>
+    /// <exception cref="ArgumentException">
+    ///     <para><paramref name="value" /> is not a class.</para>
+    ///     -or-
+    ///     <para><paramref name="type" /> is not a class.</para>
+    /// </exception>
     [Pure]
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool Inherits(this Type value, Type type)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
-
-        if (type is null)
-        {
-            throw new ArgumentNullException(nameof(type));
-        }
+        ArgumentNullException.ThrowIfNull(value);
+        ArgumentNullException.ThrowIfNull(type);
 
         if (!value.IsClass)
         {
diff --git a/X10D/src/Text/StringExtensions.cs b/X10D/src/Text/StringExtensions.cs
index 2f83e3c..ba9a97e 100644
--- a/X10D/src/Text/StringExtensions.cs
+++ b/X10D/src/Text/StringExtensions.cs
@@ -57,10 +57,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string Base64Decode(this string value)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return Convert.FromBase64String(value).ToString(Encoding.ASCII);
     }
@@ -75,10 +72,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string Base64Encode(this string value)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         return Convert.ToBase64String(value.GetBytes(Encoding.ASCII));
     }
@@ -104,20 +98,9 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string ChangeEncoding(this string value, Encoding sourceEncoding, Encoding destinationEncoding)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
-
-        if (sourceEncoding is null)
-        {
-            throw new ArgumentNullException(nameof(sourceEncoding));
-        }
-
-        if (destinationEncoding is null)
-        {
-            throw new ArgumentNullException(nameof(destinationEncoding));
-        }
+        ArgumentNullException.ThrowIfNull(value);
+        ArgumentNullException.ThrowIfNull(sourceEncoding);
+        ArgumentNullException.ThrowIfNull(destinationEncoding);
 
         return value.GetBytes(sourceEncoding).ToString(destinationEncoding);
     }
@@ -156,10 +139,7 @@ public static class StringExtensions
     public static T EnumParse<T>(this string value, bool ignoreCase)
         where T : struct, Enum
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         value = value.Trim();
 
@@ -214,15 +194,8 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static byte[] GetBytes(this string value, Encoding encoding)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
-
-        if (encoding is null)
-        {
-            throw new ArgumentNullException(nameof(encoding));
-        }
+        ArgumentNullException.ThrowIfNull(value);
+        ArgumentNullException.ThrowIfNull(encoding);
 
         return encoding.GetBytes(value);
     }
@@ -238,10 +211,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool IsLower(this string value)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         for (var index = 0; index < value.Length; index++)
         {
@@ -275,10 +245,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool IsPalindrome(this string value)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         if (string.IsNullOrWhiteSpace(value))
         {
@@ -323,10 +290,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static bool IsUpper(this string value)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         for (var index = 0; index < value.Length; index++)
         {
@@ -358,10 +322,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string Repeat(this string value, int count)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         switch (count)
         {
@@ -399,10 +360,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string Randomize(this string source, int length, Random? random = null)
     {
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         if (length < 0)
         {
@@ -437,10 +395,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string Reverse(this string value)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         if (value.Length < 2)
         {
@@ -471,10 +426,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static string Shuffled(this string value, Random? random = null)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         random ??= Random.Shared;
 
@@ -497,10 +449,7 @@ public static class StringExtensions
     [MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
     public static IEnumerable<string> Split(this string value, int chunkSize)
     {
-        if (value is null)
-        {
-            throw new ArgumentNullException(nameof(value));
-        }
+        ArgumentNullException.ThrowIfNull(value);
 
         if (chunkSize == 0)
         {