private void AddPictureFileHandler() { var dialog = new OpenFileDialog { Filter = "Bitmap (*.bmp)|*.bmp", Multiselect = false }; var result = dialog.ShowDialog(); if (result == DialogResult.OK) { if (dialog.FileNames.Any()) { var targetBitmap = new TargetBitmapInfo(dialog.FileName); targetBitmap.Init(); BitmapInfos.Add(targetBitmap); } } }