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我正在尝试通过发布数据来登录Gmail 。

这是我的代码：

     HttpWebRequest hi = (HttpWebRequest)HttpWebRequest.Create("https://www.google.com/accounts/ServiceLoginAuth?service=mail");
     hi.Method = "POST";
     //string PostData = "continue=https%3A%2F%2Fmail.google.com%2Fmail%2F%3Ftab%3Dwm&service=mail&rm=false&dsh=-28214021908461826&ltmpl=default&scc=1&GALX=6-CDla8snug&pstMsg=1&dnConn=&checkConnection=youtube%3A1271%3A1&checkedDomains=youtube&timeStmp=&secTok=&Email=EMAILADDRESS4u&Passwd=PASSWORD&signIn=Sign+in&rmShown=1";
     hi.ContentType = "application/x-www-form-urlencoded";
     byte[] post = UnicodeEncoding.UTF8.GetBytes(PostData);
     Stream stream = await hi.GetRequestStreamAsync();
     stream.Write(post, 0, PostData.Length);
     WebResponse response = await hi.GetResponseAsync();
     string pageSource;   
     using (StreamReader sr = new StreamReader(response.GetResponseStream()))
     {
         pageSource = sr.ReadToEnd();
     }
     mywebview1.NavigateToString(pageSource);

但是当我尝试运行它时，我得到一个错误。我该如何解决这个问题？

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