ASP.Net C# application integration

I have a customer who is looking to integrate a Zebra printer with their software platform.

"Our current ASP.Net C# application uses PrinterUtility library that accepts ESC/POS command sets. It works with our Epson thermal printers but it does not work w/ Zebra Receipt printer."

Is there an example of an article I may be able to use to help them with their problem that I may be missing or is there something I could point them in the direction of, to help them get started?

Please and Thank you!