diff --git a/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs b/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs
index be1c767ee7..b7b984bb10 100644
--- a/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs
+++ b/src/Kiota.Builder/Refiners/CommonLanguageRefiner.cs
@@ -146,7 +146,8 @@ current.Parent is CodeClass parentClass &&
             var refinedName = refineAccessorName(currentProperty.Name);
 
             if (!refinedName.Equals(currentProperty.Name, StringComparison.Ordinal) &&
-                !parentClass.Properties.Any(property => !property.Name.Equals(property.Name, StringComparison.Ordinal) && refinedName.Equals(property.Name, StringComparison.Ordinal)))// ensure the refinement won't generate a duplicate
+                !parentClass.Properties.Any(property => !currentProperty.Name.Equals(property.Name, StringComparison.Ordinal) &&
+                    refinedName.Equals(property.Name, StringComparison.OrdinalIgnoreCase)))// ensure the refinement won't generate a duplicate
             {
                 if (string.IsNullOrEmpty(currentProperty.SerializationName))
                     currentProperty.SerializationName = currentProperty.Name;
diff --git a/tests/Kiota.Builder.Tests/Refiners/CSharpLanguageRefinerTests.cs b/tests/Kiota.Builder.Tests/Refiners/CSharpLanguageRefinerTests.cs
index 33099b3b28..6bb1989bea 100644
--- a/tests/Kiota.Builder.Tests/Refiners/CSharpLanguageRefinerTests.cs
+++ b/tests/Kiota.Builder.Tests/Refiners/CSharpLanguageRefinerTests.cs
@@ -122,7 +122,7 @@ public async Task InlineParentOnErrorClassesWhichAlreadyInherit()
         };
         await ILanguageRefiner.Refine(new GenerationConfiguration { Language = GenerationLanguage.CSharp }, root);
 
-        Assert.Contains(model.Properties, x => x.Name.Equals("otherProp"));
+        Assert.Contains(model.Properties, x => x.Name.Equals("OtherProp"));
         Assert.Contains(model.Methods, x => x.Name.Equals("otherMethod"));
         Assert.Contains(model.Usings, x => x.Name.Equals("otherNs"));
     }
@@ -230,10 +230,10 @@ public async Task DoesNotEscapesReservedKeywordsForClassOrPropertyKindEnhanced()
         // Assert
         Assert.Equal("fileObject1", reservedModel.Name);// classes/models will be renamed if reserved without conflicts
         Assert.Equal("fileObject", reservedObjectModel.Name);// original stays the same
-        Assert.Equal("alias", property.Name);// property names don't bring issue in dotnet
-        Assert.Equal("file", secondProperty.Name);// property names don't bring issue in dotnet
+        Assert.Equal("Alias", property.Name);// property names don't bring issue in dotnet
+        Assert.Equal("File", secondProperty.Name);// property names don't bring issue in dotnet
         Assert.Equal("fileObject1", secondProperty.Type.Name);// property type was renamed 
-        Assert.Equal("fileObject", thirdProperty.Name);// property names don't bring issue in dotnet
+        Assert.Equal("FileObject", thirdProperty.Name);// property names don't bring issue in dotnet
         Assert.Equal("fileObject", thirdProperty.Type.Name);// property type was renamed 
 
     }
@@ -494,7 +494,7 @@ public async Task DisambiguatePropertiesWithClassNames()
             }
         }).First();
         await ILanguageRefiner.Refine(new GenerationConfiguration { Language = GenerationLanguage.CSharp }, root);
-        Assert.Equal("modelProp", propToAdd.Name);
+        Assert.Equal("ModelProp", propToAdd.Name);
         Assert.Equal("model", propToAdd.SerializationName);
     }
     [Fact]
@@ -530,7 +530,7 @@ public async Task AvoidsPropertyNameReplacementIfDuplicatedGenerated()
             }
         }).First();
         await ILanguageRefiner.Refine(new GenerationConfiguration { Language = GenerationLanguage.CSharp }, root);
-        Assert.Equal("summary", firstProperty.Name);// remains as is. No refinement needed
+        Assert.Equal("Summary", firstProperty.Name);// remains as is. No refinement needed
         Assert.Equal("_summary", secondProperty.Name);// No refinement as it will create a duplicate with firstProperty
         Assert.Equal("Replaced", thirdProperty.Name);// Base case. Proper refinements
     }