Capture inbound traffic information

I have a web application built in vb.net. The home page is "main.aspx". I have x3 other websites that are directing traffic to the this website...the redirects are pointed to the main.aspx page. How can I capture which site the traffic is coming from? I'm thinking something with the headers. I would really like to capture the referring url or something that is unique.
Stacey FontenotAsked:
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Shaun VermaakTechnical SpecialistCommented:
Internal only site?
Stacey FontenotAuthor Commented:
external site
Shaun VermaakTechnical SpecialistCommented:
You can always add analytics, such as Google Analytics

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Shaun VermaakTechnical SpecialistCommented:
You can see the source redirect by using Analytics such as Google Analytics
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