sub Postgood(strID as string , StrPassword as string , Strvcode as string )  '这个是VB代码，用这个过程可以正常登陆QQ校友
 
    Strsenddata = "u=" & strID & "&p=" & _
                    StrPassword & "&verifycode=" & Strvcode & _
                    "&aid=15000102&u1=http%3A%2F%2Fxiaoyou.
    Strsendadd = "http://ptlogin2.
    Inet1.Execute Strsendadd, "POST", Strsenddata  '发送信息

end sub



        private void Postgood(string strID, string StrPassword, string Strvcode) //这个是C#代码，不知道哪里有问题，不能正常登陆哈！
        {

                string strUrl = "http://ptlogin2.{0}&p={1}&verifycode={2}&aid=15000102&u1=http%3A%2F%2Fxiaoyou.pengyou.
                strUrl = string.Format(strUrl, strID , StrPassword , Strvcode );
                Uri uri = new Uri(strUrl);
                wr = (uri);
                s = wr.GetResponse().GetResponseStream();
                sr = new (s, Encoding.UTF8);
                string ret = sr.ReadToEnd(); //读取返回信息
                textBox4.Text = ret; //这里总是返回输入有误或系统繁忙！

               
        }

以上两段代码分别是VB和c#写的，VB代码能够正常登陆QQ校友，而C#写的却不行，不知道什么原因，望高手指点！