Have C# PrintDocument and VC++6 DLL printing on the same print job

[Ann]

I have a C# application that uses PrintDocument and PrintPage to draw
reports. Now I need to integrate a tax form printing from a legacy VC++
DLL into the C# application. One of the important requirements is that
the printing of the reports (implemented by C#) and the tax form
(implemented by VC++) to be on the same print job. For example, if
there are 10 clients we need to print the reports and tax form for,
then 10 print jobs will be sent out to printer. Each print job will
print both reports and tax form.

The printing from the VC++ DLL was handled via PCL. I have a C# wrapper
that wraps this VC++ DLL.

How should I implement this in C#? If I just put the

this.PrintDocument.Print(); //handle the reports printing
taxform.Print(); //handles the tax form printing.

They send out 2 print jobs to the printer.
Thanks in advance for your help.