VB .NET implements a special object called the Collection object that acts as a container for objects of
all types. In fact, Collection objects can hold other objects, as well as nonobject data.
In some ways, the Collection object is an object-oriented version of the Visual Basic array. It supports
the following four methods:
Adds an item to the collection. Along with the data itself, you can specify a key value by which the member can be referenced.
Returns the number of items in the collection.
Retrieves a member from the collection either by its index (or ordinal position in the collection) or by its key (assuming that a key was provided when the item was added to the collection).
Deletes a member from the collection using the member's index or key.
For example, the following code defines a collection object named colStates to hold information about U.S. states and then adds two members to it, using the state's two-letter abbreviation as a key:
Like members of an array, the members of a collection can be iterated using the For Each...Next construct. Also like arrays, collection members are accessible by their index value, although the lower bound of a collection object's index is always 1.
Arrays and collections each have advantages and disadvantages. Some of the advantages of collections over arrays are:
Note that when deleting collection members by index, it is important to iterate though the indexes inreverse order because member deletion changes the indexes of other members.
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Variables And Data Types
Introduction To Object-oriented Programming
The .net Framework: General Concepts
The .net Framework Class Library
Delegates And Events
Error Handling In Vb .net
The Language Reference
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