Monitor file access with IIS and ASP.NET

I want to put a unique image (1x1) in my client's email marketing (not spam). Like www.spypig.com, I would like to use it to see how many people actually read the email. I guess I'll need to check how many times this unique image has been available, but I can't figure out how.

So my question is, is there a way to check how many times an image file has been accessed using ASP.NET/C#?

thanks

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Track Email Reading with ASP.NET
http://www.aspnetemail.com/samples/emailtracker/default.aspx

Shows how to use the beacon image to track email messages (and some other methods).



Note that image methods will only work if the recipients' email client allows images to be displayed and allows HTTP requests to remote web servers to download images. It is entirely possible to read email only in its text form and therefore never know when the email was read.

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