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public class YourClass
{
    private readonly IDictionary<string, string> _yourDictionary = new Dictionary<string, string>();

    public string this[string key]
    {
        // returns value if exists
        get { return _yourDictionary[key]; }

        // updates if exists, adds if doesn't exist
        set { _yourDictionary[key] = value; }
    }
}





class SampleCollection<T>
{
    // Declare an array to store the data elements. 
    private T[] arr = new T[100];

    // Define the indexer, which will allow client code 
    // to use [] notation on the class instance itself. 
    // (See line 2 of code in Main below.)         
    public T this[int i]
    {
        get
        {
            // This indexer is very simple, and just returns or sets 
            // the corresponding element from the internal array. 
            return arr[i];
        }
        set
        {
            arr[i] = value;
        }
    }
}

// This class shows how client code uses the indexer. 
class Program
{
    static void Main(string[] args)
    {
        // Declare an instance of the SampleCollection type.
        SampleCollection<string> stringCollection = new SampleCollection<string>();

        // Use [] notation on the type.
        stringCollection[0] = "Hello, World";
        System.Console.WriteLine(stringCollection[0]);
    }
}
// Output: 
// Hello, World.


Link : http://msdn.microsoft.com/en-us/library/6x16t2tx.aspx

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