Check internet connction not internal network connection

i am making an application that must check before running the internet connection

i am using this code

try
{

req = (HttpWebRequest)WebRequest.Create("http://www.1aeg.net");
resp = (HttpWebResponse)req.GetResponse();

if (resp.StatusCode.ToString().Equals("OK"))
{
connected_check = "1";
}
else
{
connected_check = "2";
}
}
catch (Exception exc)
{
connected_check = "2";
}




when i logged out from the server the internet connection will be disabled but the internal network in the office is still connected.



when i logged off or i did not enters the user name and password the internet access is not available but the internal network is available through the server.


how i can detect if the internet access is available regardless the internal network connection in the office????
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