using System;

using System.Linq.Expressions;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("****************** C# Equivalent Output **************************\n\n");

        Expression<Func<int, bool>> cExpression = val => val < 10;

        var cResults = cExpression.Compile();

        Console.WriteLine(cResults(15));

        Console.WriteLine(cResults(9));

        Console.WriteLine("\n\n***************** Expression Tree Output **************************\n\n");

        ParameterExpression numParam = Expression.Parameter(typeof(int), "val");

        ConstantExpression ten = Expression.Constant(10, typeof(int));

        BinaryExpression numLessThanTen = Expression.LessThan(numParam, ten);

​

        Expression<Func<int, bool>> expression =

            Expression.Lambda<Func<int, bool>>(

                numLessThanTen,

                new ParameterExpression[] { numParam });

​

        var eResults = expression.Compile();

​

        Console.WriteLine(eResults(15));

        Console.WriteLine(eResults(9));

    }

}