How to write nested query in Linq

Question

i have got two table

1. usermaster
2. AreaMaster

my sql query is like this:

select * from tblArea  where areaid
not in (select areaid from
tblUserMaster)

please tell me how to write such nested query in linq

Answer 1

var result = tblArea.Where(x => !tblUserMaster.Any(m => m.areaid == x));

Answer 2

I can't find any good way you can do something like:

var tb1 = tblUserMaster.ToList();
var result = tblArea.AsEnumerable().Where(x => !tb1.Any(m => m.areaid == x));

but it's not a good way, It's better to write store procedure instead loading all data to client. may be someone can do this better but I think it can not be improved.

AsEnumerable() keyword moves from linq->sql to pure linq but it loads all data.

Answer 3

try this one

var result=from tblarea in db.TblArea
where
  !
    (from tblusermaster in db.TblUserMaster
    select new {
      tblusermaster.Areaid
    }).Contains(new { tblarea.Areaid })
select new {
  tblarea.Areaid,
  tblarea.Column1,
  tblarea.Column2
}