Thanks,
Rick

Easiest way is to try connect somewhere and catch exception if needed.

Hello, Rick!

You can try to connect to a well known internet resource.
try
{
    TcpClient tcpClient = new TcpClient ();
    tcpClient.Connect ("www.microsoft.com", 80);
    //connection is available
}
catch(SocketException ex)
{
    //smth is wrong - maybe there is no connection
}

The approach above is rather straightforward, can you tell why do you have to know if you're connected to the Internet.

I prefer not to have to catch exceptions, but this will work.
(I am retrieving information from the web or a local cache if not
connected.)

Thanks,
Rick

you may try this:

[System.Runtime.InteropServices.DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState(out int lpdwFlags,
int dwReserved) ;

public static bool IsConnectedToTheInternet( )
{
   int flags;
   return InternetGetConnectedState(out flags, 0);
}

AppDomains and Exceptions
String concatenation -- not the typical question
How properly return XML from an ASPX page?
cannot implicitly convert type string to bool
Converting a float to a string
How to detect a null value
Scope and values of Object
XML Schmell !!!
Why can't my delegate be public?
How to tell when a form is minimizing or closing!