All pastes #911438 Raw Edit

Something

public text v1 · immutable
·published 2008-02-20 18:27 UTC
rendered paste body
<JoA_Farore> Dim users = New Dictionary(Of String, ChatWindow)()
<JoA_Farore> users(username) = New ChatWindow()
<JoA_Farore> tha'ts pretty much it

So heres the problem:

How do I tell if users(username) already exists?