How to get a count of items in a Queue (don't understand how to use Count(Of...))

I have a handle on a queue. I want to find the count of queue items. There is method on queueItems.Count(Of …). I have seen this Count(Of …) in other places but do not understand what the syntax is.

You are right on the money! I dont think you need to add any arguments.
QueueItems.Count

Get Queue Items Activity returns IENumerable<Queueitem>.
So you can use Enumerable.Count
You can’t use ‘Count’ method to Queueitem directly.