How to get value in variable of c# from DB in Linq.???

Question

hi frnds....
                As we do in ADO.net with dataset , get the data from database and store in c# variable.
The same thin i want to do with linq.
When a user get login i want to get all the information of user from database and store in c# static variable.
But i dnt get idea that how it will be do with linq.
So please lead me if you know..

Thanks