Form1.md

namespace MediaDownloader { public partial class Form1 : Form { WMPLib.WindowsMediaPlayer player;

    public Form1()
    {
        InitializeComponent();
        initAppVk();
    }
    private void initAppVk()
    {
        string vkUrl = "https://oauth.vk.com/authorize?client_id=4658286&scope=audio&"+
                       "redirect_uri=http://oauth.vk.com/blank.html&display=mobile&response_type=token&revoke=0";
        
        Uri requestUri = new Uri(vkUrl);
        Uri callbackUri = new Uri("http://oauth.vk.com/blank.html");

        webBrowser1.Url = requestUri;

        player = new WMPLib.WindowsMediaPlayer();

    }

    private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        try
        {
            char[] separators = { '=', '&' };
            string responseString = e.Url.ToString();
            string[] responseContent = responseString.Split(separators);
            string accessToken = responseContent[1];
            int userID = Int32.Parse(responseContent[5]);
            if (userID > 0)
            {
                webBrowser1.Visible = false;
                string sURL = "https://api.vk.com/method/audio.get.xml?owner_id="+userID+"&count=100&access_token="+accessToken;
                WebRequest wrGetUrl = WebRequest.Create(sURL);
                Stream songsStream  = wrGetUrl.GetResponse().GetResponseStream();
                StreamReader songsStreamReader = new StreamReader(songsStream);
                string allText = songsStreamReader.ReadToEnd();

                if (allText.Length > 0)
                {
                    File.WriteAllText(@"c:\users\nikita\documents\visual studio 2013\Projects\MediaDownloader\MediaDownloader\songs.xml", allText);
                    DataSet dataSet = new DataSet();
                    dataSet.ReadXml(@"c:\users\nikita\documents\visual studio 2013\Projects\MediaDownloader\MediaDownloader\songs.xml");
                    dataGridView1.DataSource = dataSet.Tables[1];
                    dataGridView1.Columns[0].Visible = false;
                    dataGridView1.Columns[1].Visible = false;
                    dataGridView1.Columns[4].Visible = false;
                    dataGridView1.Columns[6].Visible = false;
                    dataGridView1.Columns[7].Visible = false;

                    DataGridViewButtonColumn downloadBtnColumn = new DataGridViewButtonColumn();
                    downloadBtnColumn.Name = "Action";
                    downloadBtnColumn.UseColumnTextForButtonValue = true;
                    downloadBtnColumn.Text = "Download & Play";

                    if (dataGridView1.Columns["Action"] == null)
                        dataGridView1.Columns.Add(downloadBtnColumn);

                    dataGridView1.Visible = true;
                    progressBar1.Visible  = true;

                    dataGridView1.CellClick += new DataGridViewCellEventHandler(dataGridView1_CellClick);


                    
                }

            }
        }
        catch
        {

        }
    }

    void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        if (e.ColumnIndex == 0)
        {
            string absolutePathToAudio = dataGridView1.Rows[e.RowIndex].Cells[6].Value.ToString();
            
            WebClient webClient = new WebClient();
           
            webClient.DownloadFileCompleted   += new AsyncCompletedEventHandler(fileCompleted);
            webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(fileProgressChanged);

            string[] parts = absolutePathToAudio.Split('?');
            Uri audioURL = new Uri(parts[0]);

            string nameOfAudio = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString() + "-" +
                                 dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString()+".mp3";

            char[] invalidSymbols = {',','|','"','*','>','<','\\','/','?'};
            for (int i = 0; i < invalidSymbols.Length; i++)
               nameOfAudio = nameOfAudio.Replace(invalidSymbols[i], ' ');

            webClient.DownloadFileAsync(audioURL, @"C:\Songs\"+nameOfAudio);

            player.controls.stop();
            player.close();
            player.URL = absolutePathToAudio;
            player.controls.play();
            
        }
    }

    void fileProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
    }

    void fileCompleted(object sender, AsyncCompletedEventArgs e)
    {
        player.controls.stop();
        progressBar1.Value = 0;
    }
}

}