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How to open process within Windows form
[DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
       private void button1_Click(object sender, EventArgs e)
    {
        Process p = Process.Start("mstsc.exe", @"c:VPN4.rdp");
        Thread.Sleep(3000);
        p.StartInfo.CreateNoWindow = true;    // new
        SetParent(p.MainWindowHandle, this.panel1.Handle);
        p.StartInfo.WindowStyle = ProcessWindowStyle.Maximized;   //new

    }

private void toolStripButton1_Click(object sender, EventArgs e)
{
  ProcessStartInfo info = new ProcessStartInfo();
  info.FileName = "notepad";
  info.UseShellExecute = true;
  var process = Process.Start(info);

  Thread.Sleep(2000);

  SetParent(process.MainWindowHandle, this.Handle);
}

ProcessStartInfo info = new ProcessStartInfo();
info.FileName = "notepad";
info.UseShellExecute = true;
Process.Start(info);