public void ProcessRequest(HttpContext context) { var request = context.Request; if (request.QueryString["contextKey"] != AjaxFileUpload.ContextKey) { throw new Exception("Invalid context key"); } if (request.Headers["Content-Type"] != null && request.Headers["Content-Type"].StartsWith("multipart/form-data;") && request.Headers["Content-Length"] != null) { AjaxFileUploadHelper.Process(context); } else { throw new Exception("Invalid upload request."); } context.Response.ContentEncoding = Encoding.UTF8; context.Response.Cache.SetCacheability(HttpCacheability.NoCache); context.Response.ContentType = "text/plain"; context.Response.End(); }