LINQ subquery IN

Question

I\'m a newbie with the IQueryable, lambda expressions, and LINQ in general. I would like to put a subquery in a where clause like this :

Sample code :

Answer 1

from c in db.Client
where (from d in db.DataDictVal 
       where d.TblTableName == "Client" 
         && d.DDColumnName == "Status"
         && dd.DdvColumnValLandDsc1.StartsWith("ac"))
       .Contains(c.Etat)
select c;