<Window x:Class="Upload_File_WPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Upload_File_WPF"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition Height="auto"></RowDefinition>
        </Grid.RowDefinitions>
        <Button Click="btnUploadFile_Click" Content="Upload File" x:Name="btnUploadFile"></Button>
        <MediaElement Grid.Row="1" LoadedBehavior="Manual" Stretch="Uniform" x:Name="mePlayer">
        </MediaElement>
        <StackPanel Grid.Row="3">
            <Label Name="lblStatus" Content="Not playing..." HorizontalContentAlignment="Center" Margin="5" />
            <WrapPanel HorizontalAlignment="Center">
                <Button Name="btnPlay" Click="btnPlay_Click">Play</Button>
                <Button Name="btnPause" Margin="5,0" Click="btnPause_Click">Pause</Button>
                <Button Name="btnStop" Click="btnStop_Click">Stop</Button>
            </WrapPanel>
        </StackPanel>
    </Grid>
</Window>
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using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Media;
using System.Security.Permissions;
using System.Text;
using System.Threading.Tasks;
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.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace Upload_File_WPF
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DispatcherTimer timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromSeconds(1);
            timer.Tick += timer_Tick;
            timer.Start();
        }
        void timer_Tick(object sender, EventArgs e)
        {
            if (mePlayer.Source != null)
            {
                if (mePlayer.NaturalDuration.HasTimeSpan)
                    lblStatus.Content = String.Format("{0} / {1}", mePlayer.Position.ToString(@"mm\:ss"), mePlayer.NaturalDuration.TimeSpan.ToString(@"mm\:ss"));
            }
            else
                lblStatus.Content = "No file selected...";
        }

        private void btnPlay_Click(object sender, RoutedEventArgs e)
        {
            mePlayer.Play();
        }

        private void btnPause_Click(object sender, RoutedEventArgs e)
        {
            mePlayer.Pause();         
        }

        private void btnStop_Click(object sender, RoutedEventArgs e)
        {
            mePlayer.Stop();   
        }

        private void btnUploadFile_Click(object sender, RoutedEventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            if(openFileDialog.ShowDialog() == true)
            {
                mePlayer.Source = new Uri(openFileDialog.FileName);
                SystemSounds.Beep.Play();
            }
        }
    }
}
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