C# 0 The Complete Reference

ArrayList

 nor 

List

has a 

way to compare two 

Inventory

 objects. There are two ways to remedy this situation. First, 

Inventory

 can implement the 

IComparable

 interface. This interface defines how two objects 

of a class are compared. Second, an 

IComparer

 object can be specified when comparisons 

are required. The following sections illustrate both approaches.

Implementing IComparable

If you want to sort a collection that contains user-defined objects (or if you want to store 

those objects in a collection such as 

SortedList

, which maintains its elements in sorted 

order), then the collection must know how to compare those objects. One way to do this is 

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for the object being stored to implement the