1.建1个空白form，然后加入1个notifyIcon控件，给notifyIcon的icon属性设置1个图标；
2.加入1个contextMenu控件，并添加菜单项
3.3.设置 notifyIcon1 的属性：
将notifyIcon1.ContextMenu 设置为 contextMenu1
代码如下：
private void menuItem1_Click(object sender, System.EventArgs e)
{
this.WindowState = FormWindowState.Maximized;
}
private void menuItem2_Click(object sender, System.EventArgs e)
{
this.WindowState = FormWindowState.Minimized;
}
private void menuItem3_Click(object sender, System.EventArgs e)
{
Application.Exit();
}
private void menuItem4_Click(object sender, System.EventArgs e)
{
this.WindowState = FormWindowState.Normal;
}