public static string HttpConnectToServer(string ServerPage,string strData)

     {

         string postData =strData;

         //解决乱码问题

         byte[] dataArray = Encoding.UTF8.GetBytes(postData);

         //创建请求

         HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ServerPage);

         request.Method = "POST";

         request.ContentLength = dataArray.Length;

         request.ContentType = "application/json;charset=UTF-8";

         //创建输入流

         Stream dataStream = null;

         try

         {

             dataStream = request.GetRequestStream();

         }

         catch (Exception)

         {

             return null;//连接服务器失败

         }

         //发送请求

         dataStream.Write(dataArray, , dataArray.Length);

         dataStream.Close();

         //读取返回消息

         string res = string.Empty;

         try

         {

             HttpWebResponse response = (HttpWebResponse)request.GetResponse();

             StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

             res = reader.ReadToEnd();

             reader.Close();

         }

         catch (Exception ex)

         {

             return null;//连接服务器失败

         }

         return res;

     }