diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClient/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClient/src/Org.OpenAPITools/Client/ClientUtils.cs
index 65d7da67f6a..a19bc430249 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClient/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClient/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -11,6 +11,7 @@
 
 using System;
 using System.Collections;
+using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -102,7 +103,7 @@ namespace Org.OpenAPITools.Client
             if (obj is ICollection collection)
                 return string.Join(",", collection.Cast<object>());
 
-            return Convert.ToString(obj);
+            return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
         /// <summary>
diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClientCore/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClientCore/src/Org.OpenAPITools/Client/ClientUtils.cs
index 65d7da67f6a..a19bc430249 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClientCore/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClientCore/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -11,6 +11,7 @@
 
 using System;
 using System.Collections;
+using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -102,7 +103,7 @@ namespace Org.OpenAPITools.Client
             if (obj is ICollection collection)
                 return string.Join(",", collection.Cast<object>());
 
-            return Convert.ToString(obj);
+            return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
         /// <summary>