Ufdjrw

I use windows7 and VS2010 to write a C# winform program.
In the program I run start a TCP socket server and a socket client. After the client socket is accepted, I send command to the client.
When I send data, error occurs: System.NullReferenceException. at this line:

 myClientSocket.Send(bs3, bs3.Length, 0); 

I have debug the program and the socket server and client could be created successfully. The client could also be connect to the server successfully.I think maybe myclientsocket is none so the command could not be sent. But I do not know why.
The code:

public partial class Form1 : Form

 public static Socket myClientSocket = null;
 protected override void OnLoad(EventArgs e)
 
 SocketServie();
 Thread.Sleep(1000);
 runclient();
 Thread.Sleep(2000);
 read();
 

 public void SocketServie()
 

 string host = "127.0.0.1";
 int port = 8024;
 socket.SetSocketOption(SocketOptionLevel.Socket,
 SocketOptionName.ReuseAddress, true); //port reuse
 socket.Bind(new IPEndPoint(IPAddress.Parse(host), port));
 socket.Listen(100);
 Thread SocketThread = new Thread(this.ListenClientConnect);
 SocketThread.IsBackground = true;
 SocketThread.Start();
 


 private void ListenClientConnect()
 

 while (true)
 
 this.clientSocket = socket.Accept();
 Thread receiveThread = new Thread(new
 ParameterizedThreadStart(ReceiveMessage));

 receiveThread.IsBackground = true;

 receiveThread.Start(this);
 Thread.Sleep(1000);
 
 


 public void ReceiveMessage(object Form1)
 
 Form2 f5 = new Form2();
 //Socket myClientSocket = (Socket)clientSocket;
 myClientSocket = (Socket)clientSocket;
 string InitCurMeter = "INIT_CUR_METERrn";
 byte[] bs = Encoding.UTF8.GetBytes(InitCurMeter);
 myClientSocket.Send(bs, bs.Length, 0);
 Thread.Sleep(2000);
 string InitVolMeter = "INIT_VOL_METERrn";
 byte[] bs2 =
 Encoding.UTF8.GetBytes(InitVolMeter);//Encoding.UTF8.GetBytes()
 myClientSocket.Send(bs2, bs2.Length, 0);
 

 public void runclient(object sender, EventArgs e)
 
 try
 
 using (Process myProcess = new Process())
 
 myProcess.StartInfo.UseShellExecute = false;
 myProcess.StartInfo.FileName = "socket_client.exe";
 myProcess.StartInfo.Arguments = "-p 8024";
 myProcess.StartInfo.CreateNoWindow = true;
 myProcess.Start();
 
 
 catch (Exception error)
 

 
 

 public static void read()
 

 try
 
 string readCurMeter = "READrn";
 byte[] bs3 = Encoding.UTF8.GetBytes(readCurMeter);
 myClientSocket.Send(bs3, bs3.Length, 0);
 
 catch (Exception e5)
 
 MessageBox.Show("read_cur error：" + e5.Message);