namespace ConsoleApplication1 {     using System;     using System.Collections.Generic;     using System.Text;     public class BankMethod : IBankAccount     {         decimal balance;         public void PayIn(decimal Account)         {             balance += Account;             //Console.WriteLine("您现在的存款是:{0}",balance);         }         public bool PayOut(decimal Account)         {             if (Balance > Account)             {                 balance -= Account;                 Console.WriteLine("您已经取走了{0},还剩下余额是:{1}", Account, balance);                 return true;             }             Console.WriteLine("提款失败！");             return false;         }         public decimal Balance         {             get { return balance; }         }         public override string ToString()         {             return string.Format("您现在的存款是:{0:C}", balance);         }     }     class Test     {         static void Main()         {             IBankAccount Huguo = new BankMethod();             IBankAccount guo = new BankMethod();             Huguo.PayIn(10000);             guo.PayIn(200000);             Console.WriteLine(Huguo.ToString());             Console.WriteLine(guo.ToString());             //BankMethod Bank = new BankMethod();             //Bank.PayIn(200000);             //Bank.PayOut(30000);         }     } }

namespace ConsoleApplication1 {     public interface IBankAccount     {         void PayIn(decimal amount);         bool PayOut(decimal amount);         decimal Balance         {             get;         }     }     public interface IBankTransfer:IBankAccount     {         bool Transfer(IBankAccount Action,decimal amount);     } }