/// <summary>
        /// UploadFiles Button Click
        /// </summary>
        private void UploadFiles_OnClick()
        {
            CommonOpenFileDialog dlg = new CommonOpenFileDialog();

            dlg.Title            = "Select the HEIC Files";
            dlg.InitialDirectory = "C:\\";
            dlg.Filters.Add(new CommonFileDialogFilter("HEIC Files", "*.heic"));
            // 다중 파일 선택 기능.m
            dlg.Multiselect = true;

            if (dlg.ShowDialog() == CommonFileDialogResult.Ok)
            {
                foreach (string file in dlg.FileNames)
                {
                    if (!ConvertFileList.Contains(file))
                    {
                        ConvertFileList.Add(file);
                    }
                    else
                    {
                        MessageBox.Show("이미 리스트에 포함되어있습니다.");
                    }
                }
            }
        }
 private void OnListViewDrop(DragEventArgs e)
 {
     if (e.Data.GetDataPresent(DataFormats.FileDrop))
     {
         string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
         foreach (string file in files)
         {
             if (file.ToLower().Contains("heic"))
             {
                 if (!ConvertFileList.Contains(file))
                 {
                     ConvertFileList.Add(file);
                 }
                 else
                 {
                     MessageBox.Show("이미 리스트에 포함되어있습니다.");
                 }
             }
         }
         ListViewBorderColor = (Brush)(new BrushConverter().ConvertFromString("LightGray"));
     }
 }