winform运用

          /* 窗体拖动事件 */
          private const int WM_NCHITTEST = 0x84;
          private const int HTCLIENT = 0x1;
          private const int HTCAPTION = 0x2;
          protected override void WndProc(ref Message m)
         {
            switch (m.Msg)
          {
            case WM_NCHITTEST:
                base.WndProc(ref m);
                if ((int)m.Result == HTCLIENT)
                    m.Result = (IntPtr)HTCAPTION;
                return;
            case 0xA3:
                return;
           }
              base.WndProc(ref m);
    }

using (new Mutex(true, Assembly.GetExecutingAssembly().FullName, out newMutexCreated))
            {
                if (!newMutexCreated)
                {
                    MessageBox.Show("服务程序已经启动");
                    System.Environment.Exit(0);
                }
            }
            
  static bool CheckRunning()
    {
        bool result = false;
        int ProceedingCount = 0;
        System.Diagnostics.Process[] Processes;
        Processes = System.Diagnostics.Process.GetProcessesByName("Server"); foreach (System.Diagnostics.Process IsProcedding in Processes)
        {
            if (IsProcedding.ProcessName == "Server")
            {
                ProceedingCount += 1;
            }
        }
        if (ProceedingCount > 1)
        {
            MessageBox.Show("服务程序已经启动", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            result = true;
        }
        return result;
    }