Demonstrating Transactions Using Interface Through C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace transactions
{
    internal class Program
    {
        private static string ac_no = "12345678";
        static void Main(string[] args)
        {
            
            Account account = new Account();
            account.SetAccount(ac_no);
            account.addDeposit(123,ac_no);
            int bal = account.checkBalance(ac_no);
            Console.WriteLine("your current balance is " + bal);
            int status = account.withdrawCash(12, ac_no);
            if(status != -1)
            {
                Console.WriteLine("Withdrawal successfull");
                int bal1 = account.checkBalance(ac_no);
                Console.WriteLine("your current balance is " + bal1);
            }
            
            account.withdrawCash(12233, ac_no);
            Console.ReadLine();
        }

        public interface ITransaction
        {
            void addDeposit(int deposit_money, string ac_no);
            int withdrawCash(int req_cash, string ac_no);
            int checkBalance(string ac_no);
        }

        public class Account : ITransaction
        {
            string account_number;
            int total_cash = 0;


            //Here we can add account number to database
            public void SetAccount(string ac_no)
            {
                this.account_number = ac_no;
            }
            

            public bool CheckAccountNumber(string ac_no)
            {
                //we can fetch data from database
                if(ac_no == this.account_number)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }


            public void addDeposit(int deposit_money,string ac_no)
            {
                if(CheckAccountNumber(ac_no) == true)
                {
                    total_cash += deposit_money;
                    Console.WriteLine("Rs "+ deposit_money +
                                      " deposit successfully");
                }
                else
                {
                    Console.WriteLine("You entered wrong account number");
                }
            }

           

            public int checkBalance(string ac_no)
            {
                if (CheckAccountNumber(ac_no) == true)
                {
                    return this.total_cash;
                }
                else
                {
                    Console.WriteLine("You entered wrong account number");
                    return -1;
                }
            }

            public bool isEnoughCash(int req_cash)
            {
                return (total_cash >= req_cash);
            }

            public int withdrawCash(int req_cash,string ac_no)
            {
                if(CheckAccountNumber(ac_no) == true)
                {
                    if (isEnoughCash(req_cash) == true)
                    {
                        total_cash -= req_cash;
                        return req_cash;
                    }
                    else
                    {
                        Console.WriteLine("You don't have required cash, 
                        please deposit money in your account");
                        return -1;
                    }
                }
                else
                {
                    Console.WriteLine("You entered wrong account number");
                    return -1;
                }
            }
        }
    }
}