This blog shows the usage of indexer

· Indexers permit instances of a class or struct to be indexed in the same way as arrays.

· Indexers are similar to properties except that their accessors take parameters.

· The indexers are usually known as smart arrays in C#.

· An indexer, also called an indexed property, is a class property that allows you to access a member variable of a class using the features of an array.

· Defining an indexer allows you to create classes that act like virtual arrays. Instances of that class can be accessed using the [] array access operator.