How to SELECT WHERE NOT EXIST using LINQ?

Question

I have to list all \"shift\" data to be assigned to an \"employee\" but shift data must not be included if it is already existing in employ

Answer 1

First of all, I suggest to modify a bit your sql query:

 select * from shift 
 where shift.shiftid not in (select employeeshift.shiftid from employeeshift 
                             where employeeshift.empid = 57);

This query provides same functionality. If you want to get the same result with LINQ, you can try this code:

//Variable dc has DataContext type here
//Here we get list of ShiftIDs from employeeshift table
List empShiftIds = dc.employeeshift.Where(p => p.EmpID = 57).Select(s => s.ShiftID).ToList();

//Here we get the list of our shifts
List shifts = dc.shift.Where(p => !empShiftIds.Contains(p.ShiftId)).ToList();