Check Internet Access on client Machine using ASP.Net

// By Suneel Kumar

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class ConnectionProperty : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (isInternetAccess())

        {

            Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('Internet Access')", true);

        }

        else

        {

            Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('No Internet Access')", true);

        }

    }

    public bool isInternetAccess()

    {

        // By Suneel Kumar

        // Returns True if connection is available

        // Replace www.yoursite.com with a site that

        // is guaranteed to be online - perhaps your

        // corporate site, or microsoft.com

        Uri objUrl = new System.Uri("http://www.google.com/");

        //Setup WebRequest

        System.Net.WebRequest objWebReq;

        objWebReq = System.Net.WebRequest.Create(objUrl);

        System.Net.WebResponse objResp = null;

        try

        {

            //Attempt to get response and return True

            objResp = objWebReq.GetResponse();

            objResp.Close();

            objWebReq = null;

            return true;

        }

        catch

        {

            // Error, exit and return False

            objWebReq = null;

            return false;

        }

    }

}