Start new console and create one class like this:

public class IndexerClass
{
	private string[] myData;

	public string this[string myTest]
	{
		get
		{
			return "Test get";
		}
	}
}


Now if Main method looks like this:

class Program
{
	static void Main(string[] args)
	{
		IndexerClass myInd = new IndexerClass();

		Console.WriteLine(myInd["A test"]);

		Console.ReadKey();
	}
}


Result would be something like this:

Test get

Example you can download from here