Unfortunately we don't have an example of the tile server which read tiles from the database and creation of those tile server is outside of the scope of the RadMap control. I'm sorry. As a quick suggestion I could recommend the following:
Create new ASP.NET page in your web project. This page should process request parameters and get zoom level and X,Y coordinates of the tile. Then it should read image from the database and return it in the response. You can find many examples of the similar code in Internet.
You definitely can implement custom tile server in the web project. The absolute URI will depend on the location of the web application. But you can use the value of the HtmlPage.Document.DocumentUri property in your Silverlight application to create it from the URI of the Silverlight application.
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