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/// <summary>

/// Method used to check for internet connectivity by piging

/// varoaus websites and looking for the response.

/// </summary>

/// <returns>True if a ping succeeded, False if otherwise.</returns>

/// <remarks></remarks>

public bool isConnectionAvailable()

{

    //build a list of sites to ping, you can use your own

    string[] sitesList = { "www.google.com", "www.microsoft.com" , "www.psychocoder.net" };

    //create an instance of the System.Net.NetworkInformation Namespace

    Ping ping = new Ping();

    //Create an instance of the PingReply object from the same Namespace

    PingReply reply;

    //int variable to hold # of pings not successful

    int notReturned = 0;

     try

        {

         //start a loop that is the lentgh of th string array we

         //created above

            for (int i = 0; i <= sitesList.Length; i++)

            {

                //use the Send Method of the Ping object to send the

                //Ping request

                reply = ping.Send(sitesList[i], 10);

                //now we check the status, looking for,

                //of course a Success status

                if (reply.Status != IPStatus.Success)

                {

                    //now valid ping so increment

                    notReturned += 1;

                }

                //check to see if any pings came back

                if (notReturned == sitesList.Length)

                {

                    _success = false;

                    //comment this back in if you have your own excerption

                    //library you use for you applications (use you own

                    //exception names)

                    //throw new ConnectivityNotFoundException(@"There doest seem to be a network/internet connection.\r\n 

                     //Please contact your system administrator");

                    //use this is if you don't your own custom exception library

                    throw new Exception(@"There doest seem to be a network/internet connection.\r\n 

                    Please contact your system administrator");

                }

                else

                {

                    _success = true;

                }

            } 

    }

    //comment this back in if you have your own excerption

    //library you use for you applications (use you own

    //exception names)

    //catch (ConnectivityNotFoundException ex)

    //use this line if you don't have your own custom exception 

    //library

    catch (Exception ex)

    {

        _success = false;

        _returnMessage = ex.Message;

    }

    return _success;

}



//Example Useage

If(!(isConnectionAvailable))

{

   //then do something

} 

{

   //then do something

}