public class GlobalMenu
{
    private string _baseurl;
    public string baseurl
    {
        get { return _baseurl; }
        set
        {
            _baseurl = value;
        }
    }

}

protected override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        string baseurl = Properties.Settings.Default.baseurl;

        GlobalMenu menumodel = new GlobalMenu();
        menumodel.baseurl = baseurl;
        ViewData["menudata"] = menumodel;
        base.OnActionExecuted(filterContext);
    }

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<MyApp.Web.Models.GlobalMenu>" %>

<%Html.RenderPartial("ViewGlobalMenu", (MyApp.Web.Models.GlobalMenu)ViewData["menudata"]); %>