Set custom Server Variable with HTTPModule

using System;
using System.Web;
using System.Reflection;

namespace MyModules
{
    public class MyModule : IHttpModule
    {
        public MyModule(){}

        public void Dispose(){}

        public void Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        void context_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;

            this.SetSV("HTTP_MyVar1", "My Server Variables 1", application);
            this.SetSV("HTTP_MyVar2", "My Server Variables 2", application);
        }

        //Set Server Variable
        void SetSV(string nome, string valore, HttpApplication application)
        {
            BindingFlags temp = BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static;

            MethodInfo addS = null;
            MethodInfo mRO = null;
            MethodInfo mRW = null;

            Type type = application.Request.ServerVariables.GetType();
            MethodInfo[] methods = type.GetMethods(temp);
            foreach (MethodInfo method in methods)
            {
                switch (method.Name)
                {
                    case "MakeReadWrite":
                        mRW = method;
                        break;
                    case "MakeReadOnly":
                        mRO = method;
                        break;
                    case "AddStatic":
                        addS = method;
                        break;
                }
            }

            mRW.Invoke(application.Request.ServerVariables, null);

            string[] values = { nome, valore };
            addS.Invoke(application.Request.ServerVariables, values);
            mRO.Invoke(application.Request.ServerVariables, null);
        }
    }
}

<httpModules>
   <add name="MyModule" type="MyModules.MyModule"/>
</httpModules>