using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Dictionary<string, int> dict = new Dictionary<string, int>();

        //Console.WriteLine(Array.Empty<string>().ToString());

        string k = "Empty";//string.Empty;

        dict.Add(k, 12);

        try {

            dict.Add(k, 2);

        } catch (Exception e) {

         Console.WriteLine("Unhandled compilation error: "+e.Message);

        }

    }

}