C# C/S登陆模块 服务器不识别客户端的请求
在客户端：
               command = Encoding.ASCII.GetBytes("Login");  //命令
                for (int i = 0; i < command.Length; i++)
                {
                    cmd[i]=command[i];
                }
                memStream = new MemoryStream();
                formatter.Serialize(memStream, user);
                memStream.Flush();
                data = memStream.ToArray();                  //将User对象序列化发送给服务器
                buffer=new byte[cmd.Length+data.Length];
                Array.Copy(cmd,0,buffer,0,cmd.Length);
                Array.Copy(data,0,buffer,cmd.Length,data.Length);
                contactWithServer.sendData(buffer,buffer.Length);
                  public void sendData(byte[] data,int len)
                  {
                      udpSendClient.Send(data,len,sendIpep);
                  }
服务器端：
                data = receiveUdpClient.Receive(ref receiveIpep);
                    MessageBox.Show(data.Length.ToString(),"数据长度");
                    int i = 0;