using System;

using System.Linq.Expressions;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

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

        string text = "This is simple text.";

​

        Console.WriteLine(text.ToUpper());

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

        Expression callExpr = Expression.Call(

        Expression.Constant(text), typeof(String).GetMethod("ToUpper", new Type[] { }));

​

​

        // The following statement first creates an expression tree,

        // then compiles it and then executes it.  

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

    }

}