using System;

public class Program

{

    public static void Main()

    {

        int time = 8,someaction=12;

        object param = 2;

        Console.WriteLine("When object is null ");

        string message = String.Format("Time: {0}, Action: {1}{2}", time,someaction,param==null?"": String.Format(", param : {0}",param) );

        Console.WriteLine(message);

        Console.WriteLine("When object is not null");

        param= null;

         message = String.Format("Time: {0}, Action: {1}{2}", time,someaction,param==null?"": String.Format(", param : {0}",param) );

        Console.WriteLine(message);

    }

}