private void deleteExistingAccount()
        {
            int         accNo1 = inputAccountNo("Enter the account number to which you want to delete: ", true);
            Customer_BO cus    = bll.isAccountExist(accNo1);

            if (cus == null)
            {
                Console.Clear();
                Console.WriteLine("SORRY: Account does not exist");
                return;
            }
            int accNo2 = inputAccountNo("You wish to delete the account held by " + cus.Name + "; If this information is correct please re-enter the account number: ", true);

            if (accNo1 != accNo2)
            {
                Console.Clear();
                Console.WriteLine("Request Rejected: Account number does not match");
                return;
            }
            bll.deleteAccount(accNo1);
            Console.Clear();
            Console.WriteLine("Account Deleted Successfully ");
        }
        /*method get account number from adminstrator and delete this specific account*/
        public void deleteAccount()
        {
            Administrator_BLL administrator = new Administrator_BLL();
            bool l_break = false;

            while (true)
            {
                try
                {
                    Console.Clear();
                    int accountNo;
                    accountNo = inputInt("Enter the account number to which you want to delete:  ");

                    Customer_BO customer = administrator.giveAccount(accountNo);
                    if (customer != null)
                    {
                        WriteLine("\n\nYou wish to delete the account held by Mr " + customer.holderName + "  If this information is correct please re - enter the account number:  ");
                        int input_2nd = 0;
                        try
                        {
                            input_2nd = System.Convert.ToInt32(ReadLine());
                        }
                        catch (Exception)
                        {
                        }
                        if (input_2nd == accountNo)
                        {
                            bool result = administrator.deleteAccount(accountNo);
                            if (result == true)
                            {
                                WriteLine("\n\nAccount Deleted Successfully");
                                l_break = true;
                            }
                            else
                            {
                                WriteLine("Error in deleting account.");
                                l_break = true;
                            }
                        }
                        else
                        {
                            WriteLine("You enter wrong account number.");
                            l_break = true;
                        }
                    }
                    else
                    {
                        WriteLine("Account is not Exist.");
                        l_break = true;
                    }
                    if (l_break == true)
                    {
                        break;
                    }
                }
                catch (Exception)
                {
                    WriteLine("Input is not correct");
                }
            }
        }