Exception

using System;

public class DataHouse
{
    public static void FindData( long ID) 
    {
        if( ID>0 && ID<1000)
            Console.WriteLine( ID );
        else
            throw new DataHouseException("已到文件尾");
    }
}

public class BankATM 
{
    public static void GetBalanceInfo( long  ID) 
    {
        try 
        {
            DataHouse.FindData(ID);
        }
        catch (DataHouseException e) 
        {
            throw new MyAppException("账号不存在",e);
        }
    }
}

//DataHouseException
public class DataHouseException:ApplicationException 
{
    public DataHouseException( string message )
        :base(message)
    {}
}

public class MyAppException:ApplicationException 
{
    public MyAppException (string message) 
        : base (message) 
    {}

    public MyAppException (string message, Exception inner)
        : base(message,inner)
    {}   
}

public class Test 
{
    public static void Main() 
    {
        try 
        {
            BankATM.GetBalanceInfo( 12345L);
        }
        catch(Exception e) 
        {
            Console.WriteLine ("出现了异常： {0}", e.Message);

            Console.WriteLine ("内部原因： {0}",e.InnerException.Message);
        }
    }
}