using System;

using System.Linq.Expressions;

using System.Collections;

using System.Collections.Generic;

using System.Reflection;

public class Program

{

    public static void Main()

    {

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

​

        string myString;

        myString = "Hello, World!";

        Console.WriteLine(myString);

​

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

​

        ParameterExpression myStringVariableExpr = Expression.Variable(typeof(String), "myString");

​

        Expression assignExpr = Expression.Assign(

            myStringVariableExpr,

            Expression.Constant("Hello, World!")

            );

​

        Expression blockExpr = Expression.Block(

            new ParameterExpression[] { myStringVariableExpr },

            assignExpr

            );

​

        Console.WriteLine(Expression.Lambda<Func<String>>(blockExpr).Compile()());

​

    }

​

}