C#抽奖机 WPF

设计页：
<Window x:Class="RandomDome.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="webattack@163.com" Height="350" Width="525">
    <Grid Background="Green">
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition ></ColumnDefinition>
            <ColumnDefinition ></ColumnDefinition>
            <ColumnDefinition ></ColumnDefinition>
            <ColumnDefinition ></ColumnDefinition>
        </Grid.ColumnDefinitions> www.zzzyk.com
        <TextBox Name="tbX" Grid.Row="0" Grid.Column="0" Width="100" Height="50" FontSize="24"></TextBox>
        <TextBox Name="tbY" Grid.Row="0" Grid.Column="1" Width="100" Height="50" FontSize="24"></TextBox>
        <Button Name="btnBegin" Grid.Row="0" Grid.Column="2" Width="100" Height="50" Content="抽奖" Click="btnBegin_Click"></Button>
        <Button Name="btnEnd" Grid.Row="0" Grid.Column="3" Width="100" Height="50" Content="暂停" Click="btnEnd_Click"></Button>

    </Grid>
</Window>

代码页面：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Threading;
using System.Windows.Threading;
namespace RandomDome
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        int i = 1;
        int j = 9;
        DispatcherTimer dt = new DispatcherTimer();
        MediaPlayer player = new MediaPlayer();
        private void btnBegin_Click(object sender, RoutedEventArgs e)
        {
            string mp = Environment.CurrentDirectory;
            int a = mp.LastIndexOf('\\');
            int b = a - 3;
            mp = mp.Substring(0, b);
            mp = mp + "\\music\\那一夜.mp3";
            player.Open(new Uri(mp, UriKind.RelativeOrAbsolute ));
            player.Play();
            dt.Interval = TimeSpan.FromMilliseconds(10);
            dt.Tick += new EventHandler(dt_Tick);
            dt.Start();

        }
        void dt_Tick(object sender, EventArgs e)
        {
            tbX.Text = i.ToString();
            tbY.Text = j.ToString();
            i++;
            j--;
            if (i==9)
            {
                i = 1;
            }
            if (j==1)
            {
                j = 9;
            }
        }
        private void btnEnd_Click(object sender, RoutedEventArgs e)
        {
            player.Stop();
            dt.Stop();

        }


    }
}

补充：软件开发 , C# ,