using System;

​

public class Program

{

    public static void Main()

    {

        string asd = null;

        try

        {

            Console.WriteLine(asd.Split(':'));

        }

        catch

        {

            Console.WriteLine("Testi 1 kaatui.");

        }

​

        asd = "asdasdasdas";

        try

        {

            Console.WriteLine(asd.Split(':'));

        }

        catch

        {

            Console.WriteLine("Testi 2 kaatui.");

        }

    }

}