Question

How can i use this query with linq. EmployeeIDs is another table.

select * 
from Employees where EmployeeID  
in  (select ID from EmployeeIDs where ID between 3 and 7)

Answer 1

var result= (
        from e in db.Employees
        where
            (
                from eId in db.EmployeeIDs
                where eId.ID>=3 && eId.ID<=7
                select eId.ID
            ).Contains(e.EmployeeID)
        select e
    );

Where db is the linq data context

or you can also do it like this:

var result= db.Employees.Where(a=>a.EmployeeID>=3 && a.EmployeeID<=7);

or you can also do it like this:

var result= (
            from e in db.Employees
            where
                (
                    from eId in db.EmployeeIDs
                    where eId.ID>=3 && eId.ID<=7
                    && e.EmployeeID==eId.ID
                    select eId.ID
                ).Any()
            select e
        );