void jianting()
{
     int port = 8888;
            UdpClient udpclient = new UdpClient(port);
            IPEndPoint ipendpoint = new IPEndPoint(IPAddress.Any, port);
            //IPEndPoint ipendpoint = new IPEndPoint(IPAddress.Parse ("192.168.1.114"), port);
            try
            {
                while (true)
                {
                    byte[] bytes = udpclient.Receive(ref ipendpoint);
                    string strIP = "信息来自" + ipendpoint.Address.ToString();
                    string strInfo = Encoding.GetEncoding("gb2312").GetString(bytes, 0, bytes.Length);
                    MessageBox.Show(strInfo+ strIP);
                }
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
            }
            
}

public string Send(string strServer, string strContent)
{
    Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    IPAddress ipaddress = IPAddress.Parse(strServer);
    byte[] btContent = Encoding.GetEncoding("gb2312").GetBytes(strContent);
    IPEndPoint ipendpoint = new IPEndPoint(ipaddress, 8888);
    socket.SendTo(btContent, ipendpoint);
    socket.Close();
    return "发送成功！";
}