Public Sub SaveCustomDSData( _
   ByVal fileName As String _
) 

Dim instance As TwainSession
Dim fileName As String
 
instance.SaveCustomDSData(fileName)

public void SaveCustomDSData( 
   string fileName
)

public:
void SaveCustomDSData( 
   String^ fileName
) 

Public Sub CustomDSDataExample(ByVal parent As IWin32Window, ByVal fileName As String)
   Dim session As TwainSession = New TwainSession()

   Try
      session.Startup2(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None, TwainLanguage.LanguageEnglish, TwainCountry.CountryUsa)
      session.SaveCustomDSData(fileName)
      session.Acquire(TwainUserInterfaceFlags.Modal or TwainUserInterfaceFlags.Show)
      session.UpdateCustomDSData(fileName)
   Catch ex As Exception
      MessageBox.Show(ex.Message)
   End Try

   session.Shutdown()
End Sub

public void CustomDSDataExample(IWin32Window parent, string fileName)
{
   TwainSession session = new TwainSession();

   try
   {
      session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
      session.SaveCustomDSData(fileName);

      session.Acquire(TwainUserInterfaceFlags.Modal | TwainUserInterfaceFlags.Show);

      session.UpdateCustomDSData(fileName);
   }
   catch (Exception ex)
   {
      MessageBox.Show(ex.Message);
   }

   session.Shutdown();
}