最近接了个小项目，用到一个技术需要模拟POST向Web服务器发送请求来进行登录，下面写一下主要代码。

              string strId = "admin";//用户名

              string strPassword = "xxxxx";//密码
              //string strsubmit = "YES";
              ASCIIEncoding encoding = new ASCIIEncoding();
              string postData = "username=" + strId;
              postData += ("&password=" + strPassword);
              //postData += ("&Accept=" + strsubmit);
              byte[] data = encoding.GetBytes(postData);
              // Prepare web request...
              HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://www.csharpcn.com/login.aspx");
              myRequest.Method = "POST";
              myRequest.ContentType = "application/x-www-form-urlencoded";
              myRequest.ContentLength = data.Length;
              Stream newStream = myRequest.GetRequestStream();
              // Send the data.
              newStream.Write(data, 0, data.Length);
              newStream.Close();
              // Get response
              HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
              StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
              string content = reader.ReadToEnd();
              //Response.Write(content);
              textBox1.Text = content;

以上代码放到一个方法里就可以获取登录CSHARPCN后的第一个页面了。