using System;

​

public class Test

{

    private static void Print(string msg)

    {

        Console.WriteLine(msg);

    }

​

    private static void t()

    {

        string s = null;

        try

        {

            s = s.TrimStart();

        }

        catch (Exception ex)

        {

            s = "";

            Print(ex.StackTrace);

            Print("----------------------------");

            throw;

        }

    }

​

    public static void Main()

    {

        try

        {

            t();

        }

        catch (Exception ex)

        {

            Print(ex.StackTrace);

        }

        Print(Environment.Version.ToString());

    }

}