When debuging the window doesn't appear - winforms

Question

`using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.Net;
using System.Threading;
namespace Server_chat
{
class server
{
private static int myProt = 10000;
private static byte[] buf2 = new byte[1024];
private static Socket serverSocket;
private static string message2;
/// <summary>
/// server socket
/// </summary>
public void Server_run()
{
IPHostEntry ipHost = Dns.Resolve(Dns.GetHostName());
IPAddress ip = ipHost.AddressList[0];
serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
serverSocket.Bind(new IPEndPoint(ip,Program.form1.localport));
serverSocket.Listen(10);
Program.form1.myscan_box = "启动监听成功 ！！";
Thread myThread = new Thread(ListenClientConnect);
myThread.IsBackground = true;
myThread.Start();
}
/// <summary>
/// 监听客户端连接
/// </summary>
private static void ListenClientConnect()
{
while (true) // 点对点通信
{
Socket clientSocket = serverSocket.Accept();
if (clientSocket.Connected == true)
{
IPEndPoint client_endpoint = (IPEndPoint)clientSocket.RemoteEndPoint;
Program.form1.myclientip_box = client_endpoint.Address.ToString() + "\\" + client_endpoint.Port.ToString();
Program.form1.myscan_box = "连接客户端 " + client_endpoint.Address.ToString() + " 成功 !!";
//服务端接收线程
Thread receiveThread = new Thread(ReceiveMessage);
receiveThread.IsBackground = true;
receiveThread.Start(clientSocket);
//服务端发送线程
Thread sendThread = new Thread(SendMessage);
sendThread.IsBackground = true;
sendThread.Start(clientSocket);
break;
}
}
}
/// <summary>
/// receive message
/// </summary>
/// <param name="clientSocket"></param>
private static void ReceiveMessage(object clientSocket)
{
Socket myClientSocket = (Socket)clientSocket;
while (true)
{
try
{
int len = myClientSocket.Receive(buf2);
message2 = Encoding.ASCII.GetString(buf2).Substring(0, len);
IPEndPoint client_endpoint = (IPEndPoint)myClientSocket.RemoteEndPoint;
Program.form1.myscan_box = client_endpoint.Address +": "+ message2;
}
catch (Exception ex)
{
Program.form1.myscan_box = ex.Message;
myClientSocket.Shutdown(SocketShutdown.Both);
myClientSocket.Close();
break;
}
}
}
/// <summary>
/// send message
/// </summary>
/// <param name="clientSocket"></param>
private static void SendMessage(object clientSocket)
{
Socket myClientSocket = (Socket)clientSocket;
while (true)
{
if (Program.form1.send_flag11 == 1)
{
myClientSocket.Send(Encoding.ASCII.GetBytes(Program.form1.message11));
Program.form1.send_flag11 = 0;
}
}
}
}
}
`When starting or debugging my program the window doesn't appear. But vs2012 suggests the debug session is ready.
When startting the program, the window appears but a popup window with the message "the program has stopped working, choose to debug or stop".
What's the problem? What should I do?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Threading;
namespace Server_chat
{
public partial class Form1 : Form
{
public string localip;
public int localport = 10002;
public string s_sendMessage;
public static int send_flag = 0;
public string message11
{
get { return s_sendMessage; }
}
public int send_flag11
{
get { return send_flag; }
set { send_flag = value; }
}
public Form1()
{
InitializeComponent();
Control.CheckForIllegalCrossThreadCalls = false;
IPHostEntry ipHost = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddr = ipHost.AddressList[0];
localip = ipAddr.ToString();
myip_box.Text = localip;
port_box.Text = localport.ToString();
server myserver = new server();
Thread th_server = new Thread(myserver.Server_run);
th_server.IsBackground = true;
th_server.Start();
}
private void setting_btn_Click(object sender, EventArgs e)
{
localport = Int16.Parse(port_box.Text);
scan_box.AppendText("\r\n" + "端口改成： " + port_box.Text);
}
private void send_btn_Click(object sender, EventArgs e)
{
s_sendMessage = chat_box.Text;
chat_box.Text = "";
scan_box.AppendText(s_sendMessage + "\r\n");
send_flag = 1;
}
}
}