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An indexer allows an object to be indexed like an array. When you define an indexer for a class, this class behaves like a virtual array. You can then access the instance of this class using the array access operator ([ ]).

Use of Indexers
Declaration of behavior of an indexer is to some extent similar to a property. Like properties, you have get and set accessors for defining an indexer. However, properties return or set a specific data member, whereas indexers returns or sets a particular value from the object instance. In other words, it breaks the instance data into smaller parts and indexes each part, gets or sets each part.
Defining a property involves providing a property name. Indexers are not defined with names, but with this keyword, which refers to the object instance. The following example demonstrates the concept:

    class ex_indexer
	    private string[] name = new string[10];
	    public string this[int index]
			    string s = name[index];
			    return s;
			    name[index] = value;
    class Program
	    static void Main(string[] args)
		    ex_indexerobj = new ex_indexer();
		    obj[0] = "ankit";
		    obj[1] = "ankeet";
		    for(int i = 0;i<=9;i++)