FQL in ASP.Net Facebook Application using FBML is not working.

Question

Here is my FQL code in ASP.Net Facebook application in FBML.

string s = Master.Api.Fql.Query("SELECT name, pic FROM user WHERE uid=" + Master.Api.Users.GetLoggedInUser()); Response.Write("s="+s);

While running the page the following error throws out,

Errors while loading page from application Runtime errors:

FBML Error (line 2): unknown tag "fql_query_response"

I have tried other FQL also but none of the code works. Please help me out of this problem.