OpenTween.MediaSelector.ValidateSelectedImagePage C# (CSharp) Method

        private void ValidateSelectedImagePage()
        {
            var idx = ImagePageCombo.SelectedIndex;
            var media = (SelectedMedia)ImagePageCombo.Items[idx];
            ImageServiceCombo.Enabled = (idx == 0);  // idx == 0 以外では投稿先サービスを選べないようにする
            ImagefilePathText.Text = media.Path;
            AlternativeTextBox.Text = media.AltText;
            ImageFromSelectedFile(media.Item, true);
        }