dataGridView1.DataSource = db.tbl_Ejare
.where(c=>c.DateSabt.CompareTo("1396-10-20") >= 0 && c.DateSabt.CompareTo("1396-10-22")<=0 ).ToList();
dataGridView1.DataSource = (from i in db.tbl_Ejare
where i.DateSabt.CompareTo("1396-10-20") >= 0 && i.DateSabt.CompareTo("1396-10-22")<=0
select i
).ToList();