Have you tried following Microsoft's documentation instead of the printer's ?jh71283 said:
Print Mode - Characteristics that are remembered until explicitly changed.
Font font selection
Selects a new font for the following data. Values for the character ‘#’ are as follows:
0 = Default font.1 = Select first font from the FontTypefaceList property.2 = Select second font from the FontTypefaceList property.And so on.
I think you'll find that the # (above) will be the the string form of number. ie "0" -> chr(30). Though I expect that below the covers, the class will follow the ESC/POS documentation, as you posted.