diff --git a/src/Kiota.Builder/Writers/CSharp/CSharpConventionService.cs b/src/Kiota.Builder/Writers/CSharp/CSharpConventionService.cs
index f7197d2894..09ecb6bcf4 100644
--- a/src/Kiota.Builder/Writers/CSharp/CSharpConventionService.cs
+++ b/src/Kiota.Builder/Writers/CSharp/CSharpConventionService.cs
@@ -19,23 +19,6 @@ public class CSharpConventionService : CommonLanguageConventionService
     public static string NullableMarkerAsString => "?";
     public override string ParseNodeInterfaceName => "IParseNode";
 
-    public static void WriteNullableOpening(LanguageWriter writer)
-    {
-        ArgumentNullException.ThrowIfNull(writer);
-        writer.WriteLine($"#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP3_1_OR_GREATER", false);
-        writer.WriteLine($"#nullable enable", false);
-    }
-    public static void WriteNullableMiddle(LanguageWriter writer)
-    {
-        ArgumentNullException.ThrowIfNull(writer);
-        writer.WriteLine($"#nullable restore", false);
-        writer.WriteLine("#else", false);
-    }
-    public static void WriteNullableClosing(LanguageWriter writer)
-    {
-        ArgumentNullException.ThrowIfNull(writer);
-        writer.WriteLine("#endif", false);
-    }
     public override void WriteShortDescription(string description, LanguageWriter writer)
     {
         ArgumentNullException.ThrowIfNull(writer);
diff --git a/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs b/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs
index cf1c4d97da..72e328f7ae 100644
--- a/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs
+++ b/src/Kiota.Builder/Writers/CSharp/CodeClassDeclarationWriter.cs
@@ -7,6 +7,7 @@ namespace Kiota.Builder.Writers.CSharp;
 public class CodeClassDeclarationWriter : BaseElementWriter<ClassDeclaration, CSharpConventionService>
 {
     public static string AutoGenerationHeader => "// <auto-generated/>";
+    public static string NullableHeader => "#nullable enable";
     public CodeClassDeclarationWriter(CSharpConventionService conventionService) : base(conventionService) { }
     public override void WriteCodeElement(ClassDeclaration codeElement, LanguageWriter writer)
     {
@@ -17,6 +18,7 @@ public override void WriteCodeElement(ClassDeclaration codeElement, LanguageWrit
         if (codeElement.Parent?.Parent is CodeNamespace)
         {
             writer.WriteLine(AutoGenerationHeader);
+            writer.WriteLine(NullableHeader);
             codeElement.Usings
                     .Where(x => (x.Declaration?.IsExternal ?? true) || !x.Declaration.Name.Equals(codeElement.Name, StringComparison.OrdinalIgnoreCase)) // needed for circular requests patterns like message folder
                     .Select(static x => x.Declaration?.IsExternal ?? false ?
diff --git a/src/Kiota.Builder/Writers/CSharp/CodeMethodWriter.cs b/src/Kiota.Builder/Writers/CSharp/CodeMethodWriter.cs
index 8ecebe7690..fb6f4e2668 100644
--- a/src/Kiota.Builder/Writers/CSharp/CodeMethodWriter.cs
+++ b/src/Kiota.Builder/Writers/CSharp/CodeMethodWriter.cs
@@ -611,16 +611,12 @@ private void WriteMethodPrototype(CodeMethod code, CodeClass parentClass, Langua
                                                                                         GetParameterSignatureWithNullableRefType(p, code) :
                                                                                         conventions.GetParameterSignature(p, code))
                                                           .ToList());
-            CSharpConventionService.WriteNullableOpening(writer);
             writer.WriteLine($"{conventions.GetAccessModifier(code.Access)} {staticModifier}{hideModifier}{completeReturnTypeWithNullable}{methodName}({nullableParameters}){baseSuffix} {{");
-            CSharpConventionService.WriteNullableMiddle(writer);
         }
-
-        writer.WriteLine($"{conventions.GetAccessModifier(code.Access)} {staticModifier}{hideModifier}{completeReturnType}{methodName}({parameters}){baseSuffix} {{");
-
-        if (includeNullableReferenceType)
-            CSharpConventionService.WriteNullableClosing(writer);
-
+        else
+        {
+            writer.WriteLine($"{conventions.GetAccessModifier(code.Access)} {staticModifier}{hideModifier}{completeReturnType}{methodName}({parameters}){baseSuffix} {{");
+        }
     }
 
     private string GetParameterSignatureWithNullableRefType(CodeParameter parameter, CodeElement targetElement)
diff --git a/src/Kiota.Builder/Writers/CSharp/CodePropertyWriter.cs b/src/Kiota.Builder/Writers/CSharp/CodePropertyWriter.cs
index 48fef8fa98..04a30f0ceb 100644
--- a/src/Kiota.Builder/Writers/CSharp/CodePropertyWriter.cs
+++ b/src/Kiota.Builder/Writers/CSharp/CodePropertyWriter.cs
@@ -18,17 +18,7 @@ public override void WriteCodeElement(CodeProperty codeElement, LanguageWriter w
                                             CodePropertyKind.QueryParameter);// Other property types are appropriately constructor initialized
         conventions.WriteShortDescription(codeElement.Documentation.Description, writer);
         conventions.WriteDeprecationAttribute(codeElement, writer);
-        if (isNullableReferenceType)
-        {
-            CSharpConventionService.WriteNullableOpening(writer);
-            WritePropertyInternal(codeElement, writer, $"{propertyType}?");
-            CSharpConventionService.WriteNullableMiddle(writer);
-        }
-
-        WritePropertyInternal(codeElement, writer, propertyType);// Always write the normal way
-
-        if (isNullableReferenceType)
-            CSharpConventionService.WriteNullableClosing(writer);
+        WritePropertyInternal(codeElement, writer, isNullableReferenceType ? $"{propertyType}?" : propertyType);
     }
 
     private void WritePropertyInternal(CodeProperty codeElement, LanguageWriter writer, string propertyType)