C# Interfaces

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

namespace InterfaceApplication{

public interface ITransactions{
    // interface members
    void showTransaction();
    double getAmount();
}

public class Transaction : ITransactions
{    private string tCode;    private string date;
    private double amount;

    public Transaction()
    {
        tCode = " ";

        date = " ";
        amount = 0.0;
    }
    public Transaction(string c, string d, double a)    {
        tCode = c;

        date = d;

        amount = a;

    }    public double getAmount()    {
        return amount;

    }    public void showTransaction()    {
        Console.WriteLine("Transaction: {0}", tCode);

        Console.WriteLine("Date: {0}", date);        Console.WriteLine("Amount: {0}", getAmount());

    }

}

    class Tester
    {
       static void Main(string[] args)

        {            Transaction t1 = new Transaction("001", "8/10/2012",         78900.00);

            Transaction t2 = new Transaction("002", "9/10/2012", 451900.00);

            t1.showTransaction();

            t2.showTransaction();

            Console.ReadKey();

        }

    }
}

Result:Transaction: 001
Date: 8/10/2012
Amount: 78900
Transaction: 002
Date: 9/10/2012
Amount: 451900