Form1.cs

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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;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace BirthDayToMyGirlFriend
{
    public partial class Form1 : Form
    {
        [DllImport("winmm")]
        public static extern bool PlaySound(string szSound, IntPtr hMod, int i);   //声明API:PlaySound
        // 下载于www.51aspx.com
        public Form1()
        {
            InitializeComponent();

            dtmBirthday.Text = "2014年08月19日";
            timer2.Interval = 1000;
        }

        private void btnOpen_Click(object sender, EventArgs e)
        {

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                txtPath.Text = openFileDialog1.FileName;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            try
            {
                DateTime dtNow = DateTime.Now.ToLocalTime();
                string strDateBir = dtmBirthday.Text + " " + txtTime.Text;
                DateTime dtB = Convert.ToDateTime(strDateBir);
                TimeSpan ts = dtB.Subtract(dtNow);

                // 下载于www.51aspx.com
                if (Convert.ToInt64 (lblLeftTime.Text) != 0)
                {
                    lblLeftTime.Text = Convert.ToInt64(ts.TotalSeconds).ToString();
          
                }
                else
                {
                    timer1.Stop();
                    timer1.Enabled = false;
                    axWindowsMediaPlayer1.URL = txtPath.Text;
                    lblMusicTime.Text = axWindowsMediaPlayer1.currentMedia.duration.ToString();
                  
                    timer2.Enabled = true;
                    timer2.Start();

                }