Сохранение рисунка из chart1. Visual Studio, C++, Windows Forms Application

chart1->SaveImage("image.bmp", ChartImageFormat::Bmp);

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) 
             {
             SaveFileDialog^ saveFileDialog = gcnew SaveFileDialog();
             saveFileDialog->Filter = L"Images|*.png;*.bmp;*.jpg";
 
            if (saveFileDialog->ShowDialog() == System::Windows::Forms::DialogResult::OK)
            {
 
               Dictionary< String^,System::Drawing::Imaging::ImageFormat^>^ diction = gcnew Dictionary< String^,System::Drawing::Imaging::ImageFormat^>();
               diction->Add(L".jpg",System::Drawing::Imaging::ImageFormat::Jpeg); 
               diction->Add(L".bmp",System::Drawing::Imaging::ImageFormat::Bmp); 
               diction->Add(L".png",System::Drawing::Imaging::ImageFormat::Png); 
               String^ extension = System::IO::Path::GetExtension(saveFileDialog->FileName);
 
               if (diction->ContainsKey(extension))
                {
                   System::Drawing::Imaging::ImageFormat^ imageFormat = diction[extension];
                    chart1->SaveImage(saveFileDialog->FileName, imageFormat);
                }
 
}