Okay, I get it :D
First thing to do when creating linq querry is to use .FirstOrDefault() method
var xx=(from x in y
where id=TempID
select z).FirstOrDefault();
Second thing to do is to check that with if else as I said..
if (xx == null)
label = "No data";
else
label = xx;
:) Here it is and it's working :)