Using API to Restart a PC in c#

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C#3.0

C#

I've already got the code written but for some reason, when i click the
button, nothing occurs. Here is the code.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

[DllImport("advapi32.dll",EntryPoint="InitiateSyste mShutdown")]
public static extern bool InitiateSystemShutdownA(string
lpMachineName, string lpMessage, int dwTimeout, int bForceAppsClosed, int
bRebootAfterShutdown);

private void button1_Click(object sender, System.EventArgs e)
{
InitiateSystemShutdownA(null,null, 30, 1, 1);
}

It compiles fine, but when i click button1, nothing happens. Any ideas?