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change css and image url

Posted By:      Posted Date: August 28, 2010    Points: 0   Category :ASP.Net
HiI have a masterpage on a site, in order to use the site the user has to login first. And after that I  would like to customize the masterpage with a unique css file and a unique imageurl for a image on the masterpage. Whar is the preferable way to achive this?

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