退出已打开的应用程序

我想知道如何正确退出我打开的应用程序。我目前尝试的方法不起作用。

我是这样打开应用程序的:

private void button1_Click(object sender, EventArgs e)
{
    if (status != true)
    {
        status = true;
        // Start a process to print a file and raise an event when done.
        myProcess.StartInfo.FileName = "C:''Users''David''Desktop''Test''Test.exe";
        myProcess.Exited += new EventHandler(Process_Exited);
        myProcess.EnableRaisingEvents = true;
        myProcess.Start();
    }
}
private void button2_Click(object sender, EventArgs e)
{
    myProcess.Close();
    status = false;
}

myProcess.Kill();