private void TbSingleFileMouseDoubleClick(object sender, MouseEventArgs e) { string filter = WinUtils.GetMultipleFilter("Audio files", filters); OpenFileDialog ofd = new OpenFileDialog { Filter = filter, Multiselect = true }; if (ofd.ShowDialog() == DialogResult.OK) { _tbSingleFile.Text = null; foreach (string file in ofd.FileNames) { _tbSingleFile.Text += "\"" + Path.GetFileName(file) + "\" "; } foreach (string file in ofd.FileNames) { if (!fileList.Contains(file)) { _btnStart.Enabled = true; fileList.Add(file); } } _nudTotalSongs.Value = fileList.Count; } }