Q:

How to pass parameters of the controller to the .aspx view? 

i have a view in .aspx
the SIGAMVC.Models. Detalle
is generated by the framework, I should never touch it
a solution that I found and it does not work here
VIEW
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site. Master" Inherits="System. Web. Mvc. ViewPage<SIGAMVC.Models. Detalle>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

             <h4><b><%:Session["TEST"] %></b></h4>     <%-- i tried por session but not found --%>   
   <h1><%=MyValue%></h1>  <%-- too --%>  
</asp:Content>

<asp:Content ID="Content3" ContentPlaceHolderID="MenuContent" runat="server">
</asp:Content>

CONTROLLER
  protected string MyValue { get; set; }
    [HttpPost]
    public ActionResult Create(Detalle detalle, int id)
    {
       Session["TEST"] = "RODRIGO ALEX";   //first tried
      this. MyValue = "Some Value";      // second tried
       return View(detalle);
    } 

A:

Take a look at using ViewData and ViewBag.  
ViewBag.detalle = detalle;

Alternatively:
ViewData["detalle"] = detalle;

For more information on when to use which one this blog post is a great reference.