////获取附件链接下载开始
                                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(MyLink);
                                request.Method = "GET";
                                request.Headers.Clear();
                                request.Headers[HttpRequestHeader.Cookie] = webBrowser1.Document.Cookie;
                                request.ContentType = "application/x-www-form-urlencoded";
                                request.KeepAlive = true;
                                request.AllowAutoRedirect = true;
                              
                               
                                HttpWebResponse httpResponse = (HttpWebResponse)request.GetResponse();
                         
                                string mydownurl = httpResponse.ResponseUri.ToString();
                                httpResponse.Close();
               

                                ///获取附件链接下载结束