private void CaptureCanvasBtn_Clicked(object sender, RoutedEventArgs e)
{
var png = DrawCanvas.ToBitmap().ToPng();
var saveFileDialog = new SaveFileDialog();
saveFileDialog.FileName = DateTime.Now.ToString("yyyy_MM_dd_HHmmss");
saveFileDialog.Filter = "Png File (*.png) | *.png";
if (saveFileDialog.ShowDialog() == true)
{
using (Stream fileStream = File.Create(saveFileDialog.FileName))
{
png.Save(fileStream);
}
}
}