How to add multiple files to Windows Media Player in C#?

Yeah I tried many times. Still i'm trying that one. But i'm not getting anything about that. Actually I want to play song continuously one by one, without stop, without pressing any button or any files. So can you help me?

THIS IS MY CODE HERE I CAN PLAY SONG DIRECTLY BUT IT WILL PLAY ONLY ONE SONG AND STOP THERE I WANT TO PLAY 2ND SONG WITHOUT PRESSING ANY BUTTON OR FILES


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.IO;

namespace Mp3Player
{
public partial class frmMp3Player : Form
{
bool _IsAddFiles = false;
string[] files, paths;

public frmMp3Player()
{
InitializeComponent();
}

private void btnPlay_Click(object sender, EventArgs e)
{
_IsAddFiles = false;
OpenFileDialog opd = new OpenFileDialog();
opd.Multiselect = true;

if (opd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
files = opd.SafeFileNames;
paths = opd.FileNames;
for (int i = 0; i < files.Length; i++)
{
listBox1.Items.Add(files[i]);
}
}
}

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (_IsAddFiles.Equals(false))
{
int index = int.Parse(listBox1.SelectedIndex.ToString());
axWindowsMediaPlayer1.URL = paths[index];
}
else
{
string fileName = listBox1.SelectedItem.ToString();
axWindowsMediaPlayer1.URL = @"D:\Mp3Files\" + fileName;
}
}

private void btnAdd_Click(object sender, EventArgs e)
{
_IsAddFiles = true;
string file1=string.Empty;
DirectoryInfo directory = new DirectoryInfo(@"D:\Mp3Files");
FileInfo[] files = directory.GetFiles("*.mp3");
foreach (FileInfo file in files)
{
file1 = file.Name;
listBox1.Items.Add(file1);
}
}

private void frmMp3Player_Load(object sender, EventArgs e)
{
//if (axWindowsMediaPlayer1.playState != WMPLib.WMPPlayState.wmppsPlaying)

LoadSongs();
if (listBox1.Items.Count != 0)
{
for (int i = 0; i < listBox1.Items.Count; i++)
{
listBox1.SelectedIndex = i;
break;
}
}
}

public void LoadSongs()
{
_IsAddFiles = true;
string file1 = string.Empty;
DirectoryInfo directory = new DirectoryInfo(@"D:\Mp3Files");
FileInfo[] files = directory.GetFiles("*.mp3");

foreach (FileInfo file in files)
{
file1 = file.Name;
listBox1.Items.Add(file1);
}
}
}
}