Media Element source property in code behind

Question

Hi, I am developing one application in that I have more than 5 media elements. I want to assign path to media element source from database.For that I have created one silverlight application and there is a ClientBin in silverlight website, I have saved my uploaded videos in clientbin and that path in database. But from code behind if i assign the path its not showing anything. my sample code is mplayer.Source = new System.Uri(@"D:\sample\sample.Web\ClientBin\Lake.wmv", UriKind.Absolute); Can you please tell me is there any other way to assign path to source property or what is the mistake I have done in that code. Thanks in Advance Pavani