Code:
private void toolStripButton2_Click(object sender, EventArgs e)
    {
    OpenFileDialog dlg = new OpenFileDialog();
    dlg.FileName = String.Empty;
    dlg.Title = "Open Images";
    dlg.Filter = "Image Files(*.png; *.jpg; *.bmp)|*.png; *.jpg; *.bmp";
    DialogResult dr = dlg.ShowDialog();
    if (dr == DialogResult.OK)
    {
    pathDiskCover = System.IO.Path.GetFullPath(dlg.FileName)
...