LINQ join

gistfile1.cs

var shoppingLists = from user in Users
                                join listUsers in ShoppingListUsers
                                    on user.UserId equals listUsers.UserId
                                join lists in ShoppingLists
                                    on listUsers.ShoppingListId equals lists.ShoppingListId
                                where user.UserId == userToFind.UserId
                                select lists;

return shoppingLists;