using System;

using System.Linq;

using System.Linq.Expressions;

public class Program

{

    public static void Main()

    {       

        Console.WriteLine(Method1(x => x + " add string"));

        Console.WriteLine(Method2(x => x + " add string"));

    }

    public static string Method1(Expression<Func<string, string>> expression)

    {

        string x = "Method1";

        var method = expression.Compile();

​

        return method(x);       

    }

​

    public static string Method2(Func<string, string> expression)

    {

        string x = "Method2";

​

        return expression(x);

    }

}