public async Task <string> IssueChequeBook(ChequeBook chequeBook)
        {
            chequeBook.ChequeBookNumber = RandomNumberHelper.GenerateNumber();
            await bankDBContext.AddAsync <ChequeBook>(chequeBook);

            await bankDBContext.SaveChangesAsync();

            return(chequeBook.ChequeBookNumber);
        }
        public async Task <string> Add(Account account)
        {
            account.AccountNumber = RandomNumberHelper.GenerateNumber();
            await bankDBContext.AddAsync <Account>(account);

            await bankDBContext.SaveChangesAsync();

            return(account.AccountNumber);
        }