Render pages within _Layout.cshtml of other types. Asp.Net MVC 4

Question

I’m basically developing a kind of social network, but I’m having some problems rendering pages inside my _Layout.cshtml page.

Html

<ul class="dropdown-menu">
    <li class="header">Você tem @pUser.RequestsToAccept.Count requisições enviadas.</li>
    @{Html.RenderAction("RequestToAccept", "ProfessionalUserHasClient");}
    <li class="footer"><a href="#">Últimas requisições enviadas</a></li>
</ul>

You’re making this mistake

A public action method 'Requesttoaccept' was not found on controller 'Manylife.ASP.Areas.Professional.Controllers.Professionaluserhasclientcontroller'.

If I modify for Renderpage

<li class="header">
    Você tem @pUser.RequestsToAccept.Count requisições enviadas.
</li>
@RenderPage("~/Areas/Professional/Views/ProfessionalUserHasClient/RequestToAccept.cshtml")
<li class="footer"><a href="#">Últimas requisições enviadas</a></li>

{"Erro ao executar a solicitação filho do manipulador 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'."}

I do not know if I am doing the best way, but the print below shows the situation, I need to access the "Requesttoaccept.cshtml" in that open tab on the right side, and every view exchange reloads it, because it is waiting for requests for "friendship requests":

Man Controller

[Authorize]
public class ProfessionalUserHasClientController : Controller
{
    public ActionResult Dashboard(ProfessionalUser pUser)
    {
        List<SimpleUser> listProfessionalUserHasClient = new List<SimpleUser>();

        using (ProfessionalUserDAO dao = new ProfessionalUserDAO())
        {
            listProfessionalUserHasClient = dao.ListProfessionalHasClient(pUser.IdProfessionalUser);
        }

        return View(listProfessionalUserHasClient);
    }

    [HttpPost]        
    public ActionResult RequestToAccept()
    {
        ProfessionalUser pUser = Session["ProfessionalUserLogged"] as ProfessionalUser;

        return View(pUser.RequestsToAccept);
    }

    [HttpPost]
    public ActionResult RequestSended()
    {
        ProfessionalUser pUser = Session["ProfessionalUserLogged"] as ProfessionalUser;

        return View(pUser.RequestSended);
    }
}

NOTE: I forgot to tell you that using @RenderPage it loads normally, but when I use the menu on the left to call other views from other controls, it says that I’m trying to load a Simpleuser type object into a View that expects a List from a type object "x", in the action that he should pass, he returns this list normally to the View.

Answer 1

Modify:

[HttpPost]        
public ActionResult RequestToAccept()
{
    ProfessionalUser pUser = Session["ProfessionalUserLogged"] as ProfessionalUser;

    return View(pUser.RequestsToAccept);
}

To:

[AcceptVerbs(HttpVerbs.Post | HttpVerbs.Get)]
[ChildActionOnly]
public ActionResult RequestToAccept()
{
    ...
}