using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {       

        var strValue = "";

        GetValue(1, out strValue);

        Console.WriteLine(strValue);

    }

    public static void GetValue(int intKey, out string strOptionValue)

    {

        var optionList = new Dictionary<int, string>()

        {

            {1, "Hi!"},

            {2, "Hello!"}

        };

        optionList.TryGetValue(intKey, out strOptionValue);

    }

}