diff --git a/src/libraries/Common/src/System/ThrowHelper.cs b/src/libraries/Common/src/System/ThrowHelper.cs
index 098b8321492764..0e9117b9e7bf69 100644
--- a/src/libraries/Common/src/System/ThrowHelper.cs
+++ b/src/libraries/Common/src/System/ThrowHelper.cs
@@ -31,46 +31,6 @@ internal static void ThrowIfNull(
         [DoesNotReturn]
 #endif
         private static void Throw(string? paramName) => throw new ArgumentNullException(paramName);
-
-        /// <summary>
-        /// Throws either an <see cref="System.ArgumentNullException"/> or an <see cref="System.ArgumentException"/>
-        /// if the specified string is <see langword="null"/> or whitespace respectively.
-        /// </summary>
-        /// <param name="argument">String to be checked for <see langword="null"/> or whitespace.</param>
-        /// <param name="paramName">The name of the parameter being checked.</param>
-        /// <returns>The original value of <paramref name="argument"/>.</returns>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-#if NET
-        [return: NotNull]
-#endif
-        public static string IfNullOrWhitespace(
-#if NET
-            [NotNull]
-#endif
-            string? argument,
-            [CallerArgumentExpression(nameof(argument))] string paramName = "")
-        {
-#if !NET
-            if (argument == null)
-            {
-                throw new ArgumentNullException(paramName);
-            }
-#endif
-
-            if (string.IsNullOrWhiteSpace(argument))
-            {
-                if (argument == null)
-                {
-                    throw new ArgumentNullException(paramName);
-                }
-                else
-                {
-                    throw new ArgumentException(paramName, "Argument is whitespace");
-                }
-            }
-
-            return argument;
-        }
     }
 }
 
diff --git a/src/libraries/Microsoft.Extensions.Options/tests/SourceGenerationTests/Extensions/TimeSpanAttribute.cs b/src/libraries/Microsoft.Extensions.Options/tests/SourceGenerationTests/Extensions/TimeSpanAttribute.cs
index e1e7639fc6af04..b2c3da04f71d4b 100644
--- a/src/libraries/Microsoft.Extensions.Options/tests/SourceGenerationTests/Extensions/TimeSpanAttribute.cs
+++ b/src/libraries/Microsoft.Extensions.Options/tests/SourceGenerationTests/Extensions/TimeSpanAttribute.cs
@@ -85,9 +85,7 @@ public TimeSpanAttribute(int minMs, int maxMs)
     /// <param name="min">Minimum represented as time span string.</param>
     public TimeSpanAttribute(string min)
     {
-        _ = ThrowHelper.IfNullOrWhitespace(min);
-
-        _min = min;
+        _min = ThrowIfNullOrWhitespace(min);
         _max = null;
     }
 
@@ -98,11 +96,20 @@ public TimeSpanAttribute(string min)
     /// <param name="max">Maximum represented as time span string.</param>
     public TimeSpanAttribute(string min, string max)
     {
-        _ = ThrowHelper.IfNullOrWhitespace(min);
-        _ = ThrowHelper.IfNullOrWhitespace(max);
+        _min = ThrowIfNullOrWhitespace(min);
+        _max = ThrowIfNullOrWhitespace(max);
+    }
+
+    private static string ThrowIfNullOrWhitespace(string? value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            throw value is null ?
+                new ArgumentNullException(nameof(value)) :
+                new ArgumentException("Value cannot be empty or whitespace.", nameof(value));
+        }
 
-        _min = min;
-        _max = max;
+        return value;
     }
 
     /// <summary>