If you need to cancel or disable printing at all you can use the following approach. First, you need to implement a custom print handler. A sample print handler that disables printing is given below.

class SamplePrintHandler : PrintHandler
{
    public PrintStatus OnPrint(PrintJob printJob)
    {
        return PrintStatus.CANCEL;
    }
} 


Then, you need to replace current PrintHandler with the new one:

browser.PrintHandler = new SamplePrintHandler();