using System;

using System.Linq;

using System.Linq.Expressions;

using System.Linq.Dynamic.Core;

public class Program

{

    public static void Main()

    {

        var q = new [] { 1, 2, 3 }.AsQueryable();

        var list = q.Select("string(null)");

        foreach (var x in list)

        {

            Console.WriteLine("x = '" + x + "' isnull? -->" + (x == null));

        }

    }

}