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C#, VB6, Email

Posted on 2011-02-11
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Last Modified: 2012-05-11
Hi All

I have a CMS program that is written in VB6 that manages member databases for clubs etc.

Given the prevalence for Email trackers ie. Respond when someone opens your email or clicks on a link. I was looking to build this type of tracking into my app. This is not a SPAM program as batch emails are sent to only members in DB who are opted in for such contact.

I am happy to build this in either VB6 or Interop with C#.

Any ideas where I start with this, haven't found anything handy online.

FLOG51
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Question by:FLOG51
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Expert Comment

by:jorge_toriz
ID: 34872659
1. Create a GenericHandler that renders an image of 1x1 pixels (blank content)
2. This handler will receive a QueryString variable, this variable will contain the unique id for your e-mail (I propose the use of GUID)
3. Each time your GenericHandler receives a request, it takes the query string variable and then you can update your database recording the activity.
4. In your e-mails, send an image element that points to your GenericHandler with the unique query string variable
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Author Comment

by:FLOG51
ID: 34878344
Hi jorge_toriz:

Ok, I get the idea of what you are suggesting, but can't get my head around how an image can be triggered to send a response to Handler on email being opened.

Can you point me in the direction of some sample code on this subject?
Thanks
FLOG51
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LVL 15

Accepted Solution

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jorge_toriz earned 2000 total points
ID: 34879342
Tracker.ashx code:

<%@ WebHandler Language="C#" Class="Tracker" %>

using System;
using System.Web;
using System.IO;

public class Tracker : IHttpHandler
{
    public void ProcessRequest (HttpContext context)
    {
        context.Response.ContentType = "image/jpeg";

        string trackingId = context.Request.QueryString["ti"];
        if (trackingId != null && trackingId != string.Empty)
        {
            //Update your database to say that e-mail with this trackingId has been readed
            /*
             * In your e-mail you must add a code like this <a src="http://www.yourdomain.com/Tracker.ashx?ti=kfhywejdasuiefhiasgf" />
             * The value of "ti" query string variable must be unique (I suggest the use of Guid.NewGuid().ToString())
             */
        }
    }
    public bool IsReusable
    {
        get {
            return false;
        }
    }
}

You will be referencing this generic handler inside the e-mails that you will send to verify when your e-mail are being read
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Author Closing Comment

by:FLOG51
ID: 34880198
Hi jorge_toriz

Spectacularly Perfect Answer:
Thanks very much, this gives me everything I needed to know.
Keep up the good work.
FLOG51
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