public virtual ICollection Keys { get;}
public virtual ICollection Values { get;}

//Demonstrate a SortedList.

using System;
using System.Collections;

class SortedListDemo
{
	public static void Main()
	{
		// create a sorted SortedList.
		SortedList sortedList = new SortedList();

		// Add elements to the table
		sortedList.Add("sky" , "Blue");
		sortedList.Add("Rose" , "Red");
		sortedList.Add("Water" , "Transparent");
		sortedList.Add("Pumpkin" , "Orange");

		// Can also add by using the indexer.
		sortedList["Book"] = "Written Document";

		// Get a collection of the keys.
		ICollection iCollection = sortedList.Keys;

		// Use the keys to obtain the values.
		Console.WriteLine("Contents of the list through indexer's.");
		foreach(string str in iCollection)
			Console.WriteLine(str + ": " +sortedList[str]);
		Console.WriteLine();

		//Display the List using integer indexes.
		Console.WriteLine("Contents by means of the integer indexes.");
		for(int i = 0; i < sortedList.Count; i++)
			Console.WriteLine(sortedList.GetByIndex(i));
		Console.WriteLine();

		// Show integer indexes of all the entries.
		Console.WriteLine("Integer indexes of all the Entries. ");
		foreach(string str in iCollection)
			Console.WriteLine(str + ": " + sortedList.IndexOfKey(str));
		Console.Read();
	}
}