1.打开VS2019，创建界面和按钮

2. 代码如下：

private void button1_Click(object sender, EventArgs e)

{

downpc(txttime.Text);

}

private static void downpc(string time)

{

Process.Start("shutdown", "/s /t "+time);

}

private void button2_Click(object sender, EventArgs e)

{

Process.Start("shutdown", "-a");

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void LinkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)

{

System.Diagnostics.Process.Start("https://www.cnblogs.com/pingg2019/");

}