C# 倒计时可实现输入XX分XX秒的倒计时

可实现输入XX分XX秒的倒计时，如2分30秒，1分钟，30秒等均可实现

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2（）
        {
            InitializeComponent（）;
        }
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      11776  2013-08-23 15:18  CountDown\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe

     文件      28160  2013-08-23 15:18  CountDown\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb

     文件      14328  2013-08-23 15:18  CountDown\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe

     文件        490  2009-06-11 05:14  CountDown\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest

     文件       4108  2013-07-26 17:13  CountDown\WindowsFormsApplication1\CountDown.csproj

     文件        374  2013-07-26 17:08  CountDown\WindowsFormsApplication1\Form2.cs

     文件       1184  2013-07-26 17:08  CountDown\WindowsFormsApplication1\Form2.Designer.cs

     文件       5814  2013-07-26 17:09  CountDown\WindowsFormsApplication1\Form2.resx

     文件        606  2013-08-01 10:26  CountDown\WindowsFormsApplication1\Form3.cs

     文件       2164  2013-08-01 10:37  CountDown\WindowsFormsApplication1\Form3.Designer.cs

     文件       5814  2013-08-01 10:26  CountDown\WindowsFormsApplication1\Form3.resx

     文件       6016  2013-08-23 15:18  CountDown\WindowsFormsApplication1\Form_CountDown.cs

     文件       5939  2013-08-23 15:18  CountDown\WindowsFormsApplication1\Form_CountDown.Designer.cs

     文件       6008  2013-07-26 17:06  CountDown\WindowsFormsApplication1\Form_CountDown.resx

     文件        919  2013-08-23 15:18  CountDown\WindowsFormsApplication1\obj\Debug\CountDown.csproj.FileListAbsolute.txt

     文件        914  2013-08-01 10:26  CountDown\WindowsFormsApplication1\obj\Debug\CountDown.csproj.GenerateResource.Cache

     文件       1457  2013-07-26 16:51  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.csproj.FileListAbsolute.txt

     文件        981  2013-07-25 11:47  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.csproj.GenerateResource.Cache

     文件      11776  2013-08-23 15:18  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.exe

     文件        180  2013-07-26 17:13  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form1.resources

     文件        180  2013-08-01 10:26  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form3.resources

     文件        180  2013-07-25 11:34  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form_CountDown.resources

     文件      28160  2013-08-23 15:18  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.pdb

     文件        180  2013-07-26 17:13  CountDown\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Properties.Resources.resources

     文件        505  2013-07-25 09:05  CountDown\WindowsFormsApplication1\Program.cs

     文件       1380  2013-07-25 09:05  CountDown\WindowsFormsApplication1\Properties\AssemblyInfo.cs

     文件       2898  2013-07-25 09:05  CountDown\WindowsFormsApplication1\Properties\Resources.Designer.cs

     文件       5612  2013-07-25 09:05  CountDown\WindowsFormsApplication1\Properties\Resources.resx

     文件       1109  2013-07-25 09:05  CountDown\WindowsFormsApplication1\Properties\Settings.Designer.cs

     文件        249  2013-07-25 09:05  CountDown\WindowsFormsApplication1\Properties\Settings.settings

............此处省略14个文件信息