using System;

using System.Linq;

using System.Collections.Generic;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

        // Just for example ...

        bool condition(int conditionNr) {

            Console.WriteLine("Testing condition #{0}", conditionNr);

            return false;

        }

        // The expesinve Query

        var userId = 5;

        var expensiveDbAccess = new Lazy<Task<IEnumerable<int>>>(async () => {

            Console.WriteLine("Executing expensive query for User '{0}'", userId);

            await Task.Delay(1000); // "Doing some work"

            return new List<int>{1,2,3,4,5};

        });

        Console.WriteLine("Going down the rabbit hole ...");

        if(condition(1)){ Console.WriteLine("1"); }

        else if(condition(2)){ Console.WriteLine("2"); }

        else if(condition(3)){ Console.WriteLine("3"); }

        else if( (await expensiveDbAccess.Value).Contains(6) ){ Console.WriteLine("Contained 6"); }

        else if( (await expensiveDbAccess.Value).Contains(3) ){ Console.WriteLine("Contained 3"); }

        else if(condition(4)){ Console.WriteLine("4"); }

        else if(condition(5)){ Console.WriteLine("5"); }

    }

}