title: asp.net membership provider get UserName by UserId
body: <p>I have seen a lot of question asking about known user name and how to retrieve UserId accordingly. How about the other way around?</p>
  
  <p>For some reason I have UserId, but I don't want to include aspnet_User table into my data entities. Is there any way I can retrieve the user name without querying against aspnet_User table?</p>