[DllImport("User32.dll ", EntryPoint = "SetParent")]
        private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
        [DllImport("user32.dll ", EntryPoint = "ShowWindow")]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
        
        private void btn_ThreadPool_Click(object sender, EventArgs e)
        {

            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe ";
            p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Minimized;//加上这句效果更好
            p.Start();
            System.Threading.Thread.Sleep(100);//加上，100 如果效果没有就继续加大
            SetParent(p.MainWindowHandle, panel1.Handle);
　　　　　　　//panel1.Handle为要显示外部程序的容器
            ShowWindow(p.MainWindowHandle, 3);

        }