An ArrayList is a specific type of collection. This article may help clarify
the relationship.

http://msdn2.microsoft.com/en-gb/library/0ytkdh4s.aspx

AppleBag,

The VB6 Collection class stores key-value pairs and can be searched by
key or index where the index represents the position in the data
structure where the item is stored.  If an index is not specified
during insertion then the item is added at the end.

The ArrayList only stores values.  You can search by index similar to
the way all array data structures work, but you cannot search it by key
because a key is not stored.

If you reference Microsoft.VisualBasic.dll you'll be able to use a VB6
like Collection.  There's really no equivalent data structure in the
System.* namespace hierarchy.  The VB6 Collection is more or less an
amalgamation of ArrayList and Hashtable found in the System.Collections
namespace.

Brian