Vista - Enumerating printers in WPF

I'm trying to enumerate the printers on a machine for an application,
but not having much luck! It's easy to get "local" printers using, for
example:

PrintServer myPrintServer = new LocalPrintServer();

PrintQueueCollection myPrintQueues =
myPrintServer.GetPrintQueues();

However this leaves out all network printers. For example on my
machine, this gives the XPS printer, PDF printer and Office document
writer, but leaves out the network laser printer (which is in fact the
default printer).

Can anyone tell me how to get a list of available printers? That is,
the same enumeration PrintDialog shows? This SHOULD be easy (and
probably is!) but I'm ripping my hair out!

Thanks!