using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication24
{
    class Program
    {
        static void Main(string[] args)
        {
            DynamicMethod dynamicMethod = new DynamicMethod("", null, new Type[] { typeof(Class1), typeof(Class2) }, typeof(Program), true);
            ILGenerator ilGen = dynamicMethod.GetILGenerator();
            //
            // arg1.X = arg2;
            //
            ilGen.Emit(OpCodes.Ldarg_0);
            ilGen.Emit(OpCodes.Ldarg_1);
            ilGen.Emit(OpCodes.Stfld, typeof(Class1).GetField("X", BindingFlags.Instance | BindingFlags.Public));
            //
            // Console.WriteLine(arg1.X);
            //
            ilGen.Emit(OpCodes.Ldarg_0);
            ilGen.Emit(OpCodes.Ldfld, typeof(Class1).GetField("X", BindingFlags.Instance | BindingFlags.Public));
            ilGen.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", BindingFlags.Static | BindingFlags.Public, null, new Type[] { typeof(object) }, null));
            ilGen.Emit(OpCodes.Ret);
            //
            // Result: ConsoleApplication24.Class2

            ((Action<Class1, Class2>)dynamicMethod.CreateDelegate(typeof(Action<Class1, Class2>))).Invoke(new Class1(), new Class2());
        }
    }

    class Class1
    {
        public Class1 X;
    }

    class Class2
    {
    }
}