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Email Tracking using asp.net

try

        {

 

        string emailTemplateBody = "Hy this is test mail";

        emailTemplateBody += "<tr><img src=''http://localhost:52583/HttpModule_using_beacon_images/images/<keyvalue>.aspx''  style=''opacity:0.0; filter:alpha(opacity=0);'' /></tr>";

 

 

 

        string templateName = txtTemplateName.Text;

 

                    string toEmail = mymailaddress

 

        //// Get unique Key after registring mail to be sent

        string key = bl_email_calls.RegisterSystemEmailAudit("1", templateName, DateTime.Now);

        emailTemplateBody = emailTemplateBody.Replace("<keyvalue>", key);

        //// sending e-mail

        bl_email_calls.SendMailMessage(toEmail, templateName, emailTemplateBody, key);

        using (var cn = new SqlConnection(ConfigurationManager.ConnectionStrings["webConnectionString"].ToString()))

        {

           //code to insert record in database;            }

        Response.Write("Mail sent");

        // return false;

    }

    catch (Exception ex)

    {

 

        throw;

    }

       

public class HttpModuleClass : IHttpModule

{

    //public event EventHandler BeginRequest;

 

    public void Dispose()

    {

 

    }

 

    /// <summary>

    /// public varibles

    /// </summary>

    string footerFile = "~/images/footer.png";

    //string footerFile = "~/images/ajax-loader.gif";

    Email_Calls bl_email_calls = new Email_Calls();

 

    /// <summary>

    /// Init methoed

    /// </summary>

    /// <param name="context"></param>

    public void Init(HttpApplication context)

    {

        context.BeginRequest += new System.EventHandler(GetImage_BeginRequest);

    }

 

    /// <summary>

    /// handles requests made to server and call update email read time

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="args"></param>

    public void GetImage_BeginRequest(object sender, System.EventArgs args)

    {

        //cast the sender to a HttpApplication object

        System.Web.HttpApplication application = (System.Web.HttpApplication)sender;

 

        string url = application.Request.Path; //get the url path

        //string pattern = @"/HttpModule/images/(?<key>.*).aspx";

        //string pattern = @"/HttpModule_using_beacon_images/images/(?<key>.*).aspx";

 

        string pattern = @"/HttpModule_using_beacon_images/images/(?<key>.*).aspx";

        //string pattern = @"~/images/(?<key>.*).aspx";

        //create the regex to match for beacon images

        Regex r = new Regex(pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);

        if (r.IsMatch(url))

        {

            MatchCollection mc = r.Matches(url);

            if ((mc != null) && (mc.Count > 0))

            {

                string key = (mc[0].Groups["key"].Value);

                bl_email_calls.UpdateSystemEmailAuditReadDate(key);

 

            }

 

            //now send the REAL image to the client

            //application.Response.ContentType = "image/gif";

            application.Response.ContentType = "image/png";

 

            application.Response.WriteFile(application.Request.MapPath(footerFile));

 

            //end the response

            application.Response.End();

        }

    }

}

       

mail.Headers.Add("Disposition-Notification-To", "<mail@yahoo.com>");