//special operations
        public static SELLERS SellerAllData(int id)
        {
            SELLERS seller = null;

            try
            {
                seller           = SELLERSDAL.Get(id);
                seller.ADDRESS   = SELLERSADDRESSDAL.GetAll(id);
                seller.PURCHASES = PURCHASESDDAL.GetPurchase(id);
            }
            catch (NullReferenceException nex)
            {
                seller.ADDRESS   = new List <SELLERSADDRESS>();
                seller.PURCHASES = new List <PURCHASES>();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return(seller);
        }
 //6 delete customer
 public static bool DeleteAddress(int addressID) => SELLERSADDRESSDAL.DeleteAddress(addressID);
 // 5 update customer
 public static bool UpdateAddress(SELLERSADDRESS address) => SELLERSADDRESSDAL.UpdateCustomerAddress(address);
 //4 insert customer
 public static bool InsertAddress(SELLERSADDRESS address) => SELLERSADDRESSDAL.InsertCustomerAddress(address);
 //2  getAll customers
 public static List <SELLERSADDRESS> GetALLAddress() => SELLERSADDRESSDAL.GetAll();
        //crudoperations

        //1 get customer details using id
        public static List <SELLERSADDRESS> GetAddresses(int sellerID) => SELLERSADDRESSDAL.GetAll(sellerID);