using System;

​

public class Program

{

    public static void Main()

    {

        var a = "de";

        var b = "morgan";

        var c = "s";

        var d = "law";

        var timer = DateTime.UtcNow;

        Console.WriteLine("Start ANDs");

        if (!string.IsNullOrWhiteSpace(a) && !string.IsNullOrWhiteSpace(b) && !string.IsNullOrWhiteSpace(c) && !string.IsNullOrWhiteSpace(d))

        {

            Console.WriteLine("(!A && !B && !C && !D) == true");

        }

​

        Console.WriteLine("End ANDs. Time Elapsed: " + DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff") + " - " + timer.ToString("yyyy-MM-dd HH:mm:ss.fff"));

        timer = DateTime.UtcNow;

        Console.WriteLine("Start ORs");

        if (!(string.IsNullOrWhiteSpace(a) || string.IsNullOrWhiteSpace(b) || string.IsNullOrWhiteSpace(c) || string.IsNullOrWhiteSpace(d)))

        {

            Console.WriteLine("!(A || B || C || D) == true");

        }

​

        Console.WriteLine("End ORs. Time Elapsed: " + DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff") + " - " + timer.ToString("yyyy-MM-dd HH:mm:ss.fff"));

    }

}