Dim b as Boolean
b = True
But that's not all. You can also pass Date and Color objects to the Str function as well. Pass a Date and you'll get the SQL formatted date back (YYY-MM-DD) and with Color, Str returns the color in hex form as a string. You can learn about this in the documentation for the Str function.
This tip was suggested by Jean-Luc Arnaud. Thanks Jean-Luc!