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I found this piece of code on the internet, the author of this code is Tamer Oz.

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace Coderbuddy
{

public class CheckInternetConnection
{
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState(out int Description, int ReservedValue);

public bool IsInternetConnectionAvailable()
{
int Desc;
return InternetGetConnectedState(out Desc, 0);
}
}
}