c#网络编程 服务端在线人数更新

public void Send1()
{
Socket s1 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPAddress broadcast = IPAddress.Parse(this.textBox2.Text.ToString());
IPEndPoint ep = new IPEndPoint(broadcast, 11200);
byte[] by = Encoding.GetEncoding("gb2312").GetBytes(this.yonghuming.Text.ToString());
s1.SendTo(by,ep);

}
public void Send2()
{
Socket s1 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPAddress broadcast = IPAddress.Parse(this.textBox2.Text.ToString());
IPEndPoint ep = new IPEndPoint(broadcast, 11200);
byte[] by = System.BitConverter.GetBytes(-1);
s1.SendTo(by, ep);
IPEndPoint epy = new IPEndPoint(broadcast, 11300);
byte[] bye = Encod

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