why can't run

Question

i user a api function
[ DllImport("user32") ]
public static extern long ExitWindowsEx(long uFlags, long dwReserved ) ;
but it can't be run
private void button3_Click(object sender, System.EventArgs e)
{
if(MessageBox.Show("close computer","system infomation",MessageBoxButtons.YesNo,MessageBoxIcon.Warning)==DialogResult.OK)
{sh=ExitWindowsEx(2,dwReserved);}
}
private void button3_Click(object sender, System.EventArgs e)
{
if(MessageBox.Show("close computer","system infomation",MessageBoxButtons.YesNo,MessageBoxIcon.Warning)==DialogResult.OK)
{sh=ExitWindowsEx(1,dwReserved);}
}help, help,help,

Answer 1

Sorry I can't help you....up for you!

Answer 2

// 强制关机
Process.Start("shutdown.exe","f");
// 重启
Process.Start("shutdown.exe","r");

Answer 3

using System.Runtime.InteropServices;