create a class that derives from string builder to append any number of strings : i want to create a class that derives from string builder to append any number of strings.
 My Program should allow the user input their own number of strings

  example usage:



             //Format Post Data

               //Format Post Data

                StringBuilder postData = new StringBuilder();
                postData.Append("dst");
                postData.Append("&popup=true");
                postData.Append(String.Format("&username={0}", USERNAME_Validate1));// reads username from username textbox
                postData.Append(String.Format("&password={0}", PASSWORD_Validate1));// reads password from password textbox

                //Write Post Data To Server

                using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
                    writer.Write(postData);