Printing PDF from Web Service without driver

Question

I need to print a barcode pdf document from our web service.

But following code is not success

 

string str = @"print /d:\\gmyloj59x\TLP2844 D:\LYS_FILES\Barcode\123.txt";

Process pp = System.Diagnostics.Process.Start("CMD.exe", str);

 

I think i need to use an API to print pdf files from printer without loading printer's driver.

 

Would you offer  any API for me please.