diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows/SwitchBuilder.cs b/dotnet/src/Microsoft.Agents.AI.Workflows/SwitchBuilder.cs
index 286329b6ec..0a6b9218f7 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows/SwitchBuilder.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows/SwitchBuilder.cs
@@ -39,7 +39,7 @@ public sealed class SwitchBuilder
 
         foreach (ExecutorBinding executor in executors)
         {
-            Throw.IfNull(executor, nameof(executors));
+            Throw.IfNull(executor);
 
             if (!this._executorIndicies.TryGetValue(executor.Id, out int index))
             {
@@ -68,7 +68,7 @@ public sealed class SwitchBuilder
 
         foreach (ExecutorBinding executor in executors)
         {
-            Throw.IfNull(executor, nameof(executors));
+            Throw.IfNull(executor);
 
             if (!this._executorIndicies.TryGetValue(executor.Id, out int index))
             {
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowBuilderSmokeTests.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowBuilderSmokeTests.cs
index 08f14ea541..4997197445 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowBuilderSmokeTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowBuilderSmokeTests.cs
@@ -445,9 +445,9 @@ public partial class WorkflowBuilderSmokeTests
         // Act/Assert
         Assert.Throws<ArgumentNullException>("predicate", () => switchBuilder.AddCase<string>(null!, [target]));
         Assert.Throws<ArgumentNullException>("executors", () => switchBuilder.AddCase<string>(_ => true, null!));
-        Assert.Throws<ArgumentNullException>("executors", () => switchBuilder.AddCase<string>(_ => true, [target, null!]));
+        Assert.Throws<ArgumentNullException>("executor", () => switchBuilder.AddCase<string>(_ => true, [target, null!]));
         Assert.Throws<ArgumentNullException>("executors", () => switchBuilder.WithDefault(null!));
-        Assert.Throws<ArgumentNullException>("executors", () => switchBuilder.WithDefault([target, null!]));
+        Assert.Throws<ArgumentNullException>("executor", () => switchBuilder.WithDefault([target, null!]));
     }
 
     /// <summary>