Why cant I see MvcMusicStore.sdf on my Microsoft Visual Studio 2010?

Jul 30, 2012 at 6:39 PM

Why cant I see MvcMusicStore.sdf on my Microsoft Visual Studio 2010 while on the MVCMusicStore-Completed project there is ASPNETDB.MDF and MvcMusicStore.sdf? What should I do to make it visible? 

please reply as soon as possible. thank you for your help