Finding the referring url that brought a user to my site

Duplicate:

Finding previous page Url

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How do I find the referring url that brought a user to my site in ASP.NET?

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See Also:

How can I find what search terms (if any) brought a user to my site?

From stackoverflow

• Request.UrlReferrer
  

  But this isn't guaranteed to be correct or even exist.

• HttpContext.Current.Request.UrlReferrer

• The referer URL should be in the HTTP headers on the request.

  E.g. Uri MyUrl = Request.UrlReferrer

  See: http://msdn.microsoft.com/en-us/library/system.web.httprequest.urlreferrer.aspx

• Request.UrlReferrer

  http://msdn.microsoft.com/en-us/library/system.web.httprequest.urlreferrer.aspx