public static string GenOrderID(TextBox txtOrderID) { int iicount = 0; string ID = ""; db = new db_MiletecDataContext(); var query = db.sp_GetOrderID(); foreach (sp_GetOrderIDResult count in query) { iicount = count.Count.Value; iicount = iicount++; } ++iicount; if (iicount.ToString().Length.Equals(1)) { ID = "OrderID-" + iicount.ToString().PadLeft(4, '0').ToString(); } else if (iicount.ToString().Length.Equals(2)) { ID = "OrderID-" + iicount.ToString().PadLeft(3, '0').ToString(); } else { ID = "OrderID-" + iicount.ToString().PadLeft(2, '0').ToString(); } return(txtOrderID.Text = ID); }