C#

private void buttonOpenFile_Click(object sender, EventArgs e)
{
  using(OpenFileDialog d = new OpenFileDialog())
  {
    d.InitialDirectory = @"D:\";
    d.Filter = "All jpeg files|*.jpg;*.jpeg";
    d.ShowDialog();
    _File = TagLib.File.Create(d.FileName,"image/jpeg", TagLib.ReadStyle.None);
  }
  textBox1.Text = _File.Tag.Comment;
}
private void buttonSaveFile_Click(object sender, EventArgs e)
{
  _File.Tag.Comment = textBox1.Text;
  _File.Save();
}