#32770 class about waiting for the class of the print window, selecting a number of copies, clicking the print button

I'm writing a program with Cefsharp. If you want to put the "Print" window on hold and the Print window is active, I would like to make the number of copies 2 and click the "Print" button. I would like your help.
How should c # encoding be?

print dialog menu class "# 32770"
Number of copies Box class name = "Edit5"
Print button class name = "Button15"

using System.Runtime.InteropServices;


[DllImport ("User32.dll")]
static extern int SetForegroundWindow(IntPtr point);