MVC AJAX Helper

I needed to pass in some arguments to the Create function for the other AJAX extensions and came up with this override.

Thanks to Stephen for the initial help with this article.
http://stephenwalther.com/blog/archive/2008/08/23/asp-net-mvc-tip-36-create-a-popup-calendar-helper.aspx

public static string Create(this AjaxHelper helper, string clientType, string elementId, Dictionary args)
        {
            StringBuilder argSb = new StringBuilder();
            if (args != null && args.Count > 0)
            {
                argSb.Append("{");
                foreach (string key in args.Keys)
                {
                    if (argSb.Length > 1)
                        argSb.Append(",");

                    argSb.Append("'")
                         .Append(key);
                    if (args[key].Contains("$"))
                    {
                        argSb.Append("':")
                             .Append(args[key]);
                    }
                    else
                    {
                        argSb.Append("':'")
                             .Append(args[key])
                             .Append("'");
                    }
                }
                argSb.Append("}");
            }
            //{'class':'element_wrapper'}
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("");
            return sb.ToString();
        }

            //{'class':'element_wrapper'}
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("");
            return sb.ToString();
        }