Translate SQL to linq to entites C#

SELECT  ProductID, BillType, SUM(PermitQuantity) AS quantity,  BillDate  = DATEADD(MONTH, DATEDIFF(MONTH, 0, BillDate), 0)
 FROM  ViewRpt_ProductsTrans
 WHERE BillType IN (2,3)
 AND  ProductCode='79'
 AND BillIsPermitted= 1
 GROUP BY  DATEADD(MONTH, DATEDIFF(MONTH, 0, BillDate), 0),ProductID,BillType
 ORDER BY DATEADD(MONTH, DATEDIFF(MONTH, 0, BillDate), 0)

DATEADD(MONTH, DATEDIFF(MONTH, 0, BillDate), 0)

var trans = (from p in _context.ViewRpt_ProductsTrans
                        let groupDate = new DateTime(p.BillDate.Value.Year, p.BillDate.Value.Month, 0, 0, 0, 0)
                        where
                                p.ProductID == productId &&
                                p.BillIsPermitted == true &&
                                (p.BillType == 3 || p.BillType == 2)
                        group p by
                        new
                        {
                            p.ProductID,
                            p.BranchID,
                            p.BillType,
                            groupDate
                        } into g

                        select new BranchesProductTransViewModel()
                        {
                            BillDate = g.Key.groupDate,
                            BillType = g.Key.BillType.Value,
                            BranchId = g.Key.BranchID.Value,
                            ProductId = g.Key.ProductID,
                            Quantity = g.Sum(x => x.PermitQuantity).GetValueOrDefault(0)
                        });