using System;

public class Program

{

    public static void Main()

    {

        StringDataStore strStore = new StringDataStore();

​

        strStore[0] = "One";

        strStore[1] = "Two";

        strStore[2] = "Three";

        strStore[3] = "Four";

        Console.WriteLine(strStore["one"]);

        Console.WriteLine(strStore["two"]);

        Console.WriteLine(strStore["Three"]);

        Console.WriteLine(strStore["FOUR"]);

    }

}

​

public class StringDataStore

{

    private string[] strArr = new string[10]; // internal data storage

​

    public StringDataStore()

    {

​

    }

​

    public string this[int index]

    {

        get

        {

            if (index < 0 &&  index >= strArr.Length)

                throw new IndexOutOfRangeException("Cannot store more than 10 objects");

​

            return strArr[index];

        }

​

        set

        {

            if (index < 0 &&  index >= strArr.Length)

                throw new IndexOutOfRangeException("Cannot store more than 10 objects");

​

            strArr[index] = value;

        }

    }

​

    public string this[string name]

    {

        get

        {

            foreach (string str in strArr){

                    if(str.ToLower() == name.ToLower())        

                        return str;

                    }

                return null;

        }

    }

}