using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var planets = new SortedList<int, string> {

            { 1, "Mercury" },

            { 2, "Venus" },

            { 3, "Earth" }

        };

        // TryGetValue reterives value associated with the key

        Console.WriteLine("-----TryGetValue returns true : 1-----");

        string value = "";

        if (planets.TryGetValue(3, out value))

            Console.WriteLine(value);

        // ContainsKey returns true

        Console.WriteLine("\n-----ContainsKey returns true : 2-----");

        if (planets.ContainsKey(3))

            Console.WriteLine(planets[3]); // Get Earth

        // ContainsKey returns false

        Console.WriteLine("\n-----ContainsKey returns false : 3-----");

        if (planets.ContainsKey(4))

            Console.WriteLine(planets[4]);

        else

            Console.WriteLine("Key not found");

        // TryGetValue reterives value if key exists

        Console.WriteLine("\n-----TryGetValue returns false : 4-----");

        string value1 = "";

        if (planets.TryGetValue(4, out value1))

            Console.WriteLine("value1");

        else

            Console.WriteLine("Key not found");

        // The indexer throws an exception if the requested key is not in the list

        Console.WriteLine("\n-----Exception thrown-----");

        Console.WriteLine(planets[4]);

    }

}