LINQ - Where not exists

Question

What is the equivalent of following statement in LINQ:

Select t1.appname, t1.julianDte, t1.cat 
From table1 t1 
Where NOT EXISTS 
   ( Select * 
     from ta         


        

Answer 1

Query syntax version of @Amy B's answer (with !Any inverted to All):

from t1 in db.Table1
where db.Table2.All(t2 => t1.cat != t2.cat || t2.julianDte >= t1.julianDte)
select new
{
    t1.appname,
    t1.julianDte,
    t1.cat
};