Get Auto generated ID using c# & entity Framwork with prefix

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 string prefix = "PO";
                string a = "0000000001";
                string invNo = prefix + a;
                var inv = (from p in db.PurchaseOrders
                           where p.PONO.Contains(prefix)
                           orderby p.ID descending
                           select p.PONO).FirstOrDefault();
                if (inv != null)
                {
                    a = inv.Substring(prefix.Length);
                    invNo = prefix + (Convert.ToDecimal(a) + 10000000001).ToString().Substring(1);

                }

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