Hi,
my advice is if you frequently using linq queries then,
use the below link and install sql to link converter,
even i use the same..
http://www.linqpad.net/[
^]
it is so easy and you can just build any complex query in sql and then copy paste in linqpad then in a button click you will get a linq query.
even without having sound knowledge on Linq, i have completed a whole project which uses Linq :)
Good luck..