diff --git a/modules/openapi-generator/src/main/resources/csharp-netcore/ClientUtils.mustache b/modules/openapi-generator/src/main/resources/csharp-netcore/ClientUtils.mustache
index 776be1b052f..59684096e76 100644
--- a/modules/openapi-generator/src/main/resources/csharp-netcore/ClientUtils.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp-netcore/ClientUtils.mustache
@@ -116,41 +116,6 @@ namespace {{packageName}}.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
diff --git a/samples/client/others/csharp-netcore-complex-files/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/others/csharp-netcore-complex-files/src/Org.OpenAPITools/Client/ClientUtils.cs
index 7544e0dfd80..f287a97a022 100644
--- a/samples/client/others/csharp-netcore-complex-files/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/others/csharp-netcore-complex-files/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ClientUtils.cs
index cf1c59e1a86..dcc97c295e0 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClient-ConditionalSerialization/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/ClientUtils.cs
index cf1c59e1a86..dcc97c295e0 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClient-httpclient/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ClientUtils.cs
index cf1c59e1a86..dcc97c295e0 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClient-net47/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ClientUtils.cs
index cf1c59e1a86..dcc97c295e0 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClient-net5.0/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
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 cf1c59e1a86..dcc97c295e0 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
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </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 cf1c59e1a86..dcc97c295e0 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
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>
diff --git a/samples/client/petstore/csharp-netcore/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ClientUtils.cs b/samples/client/petstore/csharp-netcore/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ClientUtils.cs
index 31c48162291..494b55f8526 100644
--- a/samples/client/petstore/csharp-netcore/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ClientUtils.cs
+++ b/samples/client/petstore/csharp-netcore/OpenAPIClientCoreAndNet47/src/Org.OpenAPITools/Client/ClientUtils.cs
@@ -120,41 +120,6 @@ namespace Org.OpenAPITools.Client
             return Convert.ToString(obj, CultureInfo.InvariantCulture);
         }
 
-        /// <summary>
-        /// URL encode a string
-        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
-        /// </summary>
-        /// <param name="input">string to be URL encoded</param>
-        /// <returns>Byte array</returns>
-        public static string UrlEncode(string input)
-        {
-            const int maxLength = 32766;
-
-            if (input == null)
-            {
-                throw new ArgumentNullException("input");
-            }
-
-            if (input.Length <= maxLength)
-            {
-                return Uri.EscapeDataString(input);
-            }
-
-            StringBuilder sb = new StringBuilder(input.Length * 2);
-            int index = 0;
-
-            while (index < input.Length)
-            {
-                int length = Math.Min(input.Length - index, maxLength);
-                string subString = input.Substring(index, length);
-
-                sb.Append(Uri.EscapeDataString(subString));
-                index += subString.Length;
-            }
-
-            return sb.ToString();
-        }
-
         /// <summary>
         /// Encode string in base64 format.
         /// </summary>