using System;

public class Program

{

    public static void Main()

    {

        int? tmp1 = null;

        Console.WriteLine("tmp1:" + (tmp1 > 0));

        string test = null;

        //Console.WriteLine("test:" + test.Trim());

        int tmp2;

        bool test2 = int.TryParse(test, out tmp2);

    }

}