Hi
There is nothing like union, intersection, in, not in or any set
properties for collections.
To test if something is in a collection you must
1. Make sure each element has a unique key when you add it
2. To test if a particular key is in the collection do
Err.Clear
On error resume next
myCollection.Add Item, ItemKey
If err.number<0 then
msgbox "Sorry, item " & ItemKey & " is in the collection"
end if
on error goto 0

Unfortunately, this adds the testing item to the collection, so you
must be sure it is the same as the original item with that key. If not,
you will need two collections - a real one and a testing one!

Does anyone out there have a custom Collection Class which has set like
properties?
regards
Paul
J Streger wrote:

I was told that you can use the 'in' command to see if a particular element
exists in a collection, but cannot figure out how to do it, and now I'm
skeptical it exists as a function. They described it as:

if strElement in colNames then
...

but this generates a syntax error, and help has no topics i can find. Can
anyone shed light on this? Also does a collection have a function like Join?
Thanks.

--
*********************
J Streger
MS Office Master 2000 ed.
MS Project White Belt 2003