Contains Query in linq

 private void BindParentExpensetype()
        {

            var parent_ids = (db.MstrBudgetLines.Where(y => y.ParenetID != null).Select(x => x.ParenetID).Distinct()).ToList();
           
            var Parents = (from e1 in db.MstrBudgetLines
                           where  e1.IsDeleted==0 && e1.IsActive==1 

                           select new
                           {
                               parentid=e1.BudgetLinesPkID,
                               BudgetLinesPkID = e1.BudgetLinesPkID,
                               BudgetLinesName = e1.BudgetLinesName
                           }).ToList().Where(x=>parent_ids.Contains(x.parentid));


            ddlparentexpensetype.DataSource = Parents;
            ddlparentexpensetype.DataValueField = "BudgetLinesPkID";
            ddlparentexpensetype.DataTextField = "BudgetLinesName";
            ddlparentexpensetype.DataBind();

        }