How to send a message in Telegram using SendMediaGroup with Text Message in C#?

Question

I want to send an Album with a text message and this is my code in C#:

    private void CInPrbdg_Click(object sender, RoutedEventArgs e)
    {
      List<FileStream> streams = new List<FileStream>
        {
            System.IO.File.OpenRead(imgpath1),
            System.IO.File.OpenRead(imgpath2),
        };

        List<InputMediaPhoto> media = new List<InputMediaPhoto>();

        foreach(var stream in streams)
        {
            media.Add(new InputMediaPhoto(new InputMedia(stream, stream.Name)) 
            {
                Caption = txt1,
                ParseMode = ParseMode.Markdown
            });
        }

        await Vbot.SendMediaGroupAsync(media, chatid);
    }

This code shows that the caption will only show like this: Image with Caption in Telegram but i want it to be like this: Album with Text Message. Thank you.