diff --git a/src/BootstrapBlazor/Extensions/LambdaExtensions.cs b/src/BootstrapBlazor/Extensions/LambdaExtensions.cs
index f3ca14afdfe..a77c62302f2 100644
--- a/src/BootstrapBlazor/Extensions/LambdaExtensions.cs
+++ b/src/BootstrapBlazor/Extensions/LambdaExtensions.cs
@@ -230,9 +230,8 @@ private static Expression GetExpression(this FilterKeyValueAction filter, Expres
 
     private static BinaryExpression Contains(this Expression left, Expression right)
     {
-        var method = typeof(string).GetMethod("Contains", [typeof(string), typeof(StringComparison)])!;
-        var comparison = Expression.Constant(StringComparison.OrdinalIgnoreCase);
-        return Expression.AndAlso(Expression.NotEqual(left, Expression.Constant(null)), Expression.Call(left, method, right, comparison));
+        var method = typeof(string).GetMethod("Contains", [typeof(string)])!;
+        return Expression.AndAlso(Expression.NotEqual(left, Expression.Constant(null)), Expression.Call(left, method, right));
     }
 
     #region Count
diff --git a/test/UnitTest/Extensions/LambadaExtensionsTest.cs b/test/UnitTest/Extensions/LambadaExtensionsTest.cs
index 07b9b6d47e9..8eef3dd73d9 100644
--- a/test/UnitTest/Extensions/LambadaExtensionsTest.cs
+++ b/test/UnitTest/Extensions/LambadaExtensionsTest.cs
@@ -244,10 +244,10 @@ public void GetExpression_Contains()
         var filter = new FilterKeyValueAction() { FieldKey = "Name", FieldValue = "test", FilterAction = FilterAction.Contains };
         var invoker = filter.GetFilterLambda<Foo>().Compile();
         Assert.True(invoker.Invoke(new Foo() { Name = "1test1" }));
-        Assert.True(invoker.Invoke(new Foo() { Name = "1Test1" }));
-        Assert.True(invoker.Invoke(new Foo() { Name = "1Test123" }));
-        Assert.True(invoker.Invoke(new Foo() { Name = "Test" }));
-        Assert.True(invoker.Invoke(new Foo() { Name = "Test2" }));
+        Assert.False(invoker.Invoke(new Foo() { Name = "1Test1" }));
+        Assert.False(invoker.Invoke(new Foo() { Name = "1Test123" }));
+        Assert.False(invoker.Invoke(new Foo() { Name = "Test" }));
+        Assert.False(invoker.Invoke(new Foo() { Name = "Test2" }));
     }
 
     [Fact]