Check Your Internet Connection With C#

By Simohamed Attahri

How to check if your computer is connected to the internet with C#. It's much more easier that other tutorials I've seen in other sites. In deed, we're going to use a simple API function InternetGetConnectedState, to return a boolean variable.

This function takes two arguments :

The first one is an integer used with out keyword, that means that after calling the function, the variable will contain an interger that describes the connection state ( use of a modem, use of a proxy, offline mode...). Note that you must refer to www.msdn.com for more information about that.
The second one is a reserved variable that must be set to 0.

In this tutorial, we'll create a class with a static function that returns true if connected and false if not, using our API function in private state.

Check this out :

public class InternetCS
{

    //Creating the extern function
    [DllImport("wininet.dll")]
    private extern static bool InternetGetConnectedState(int Description,int ReservedValue);

    //Creating a function that uses the API function
    public static bool IsConnectedToInternet()
    {
        int Desc=0;
        return InternetGetConnectedState(Desc,0) ;
    }

}

IsConnectedToInternet Check Your Internet Connection
from http://www.csharphelp.com/archives3/archive499.html