namespace Mvc3App.Controllers
{
    public class KPIController : Controller
    {

        public ActionResult UserPage(string per_oid)
        {
            PageParameters PageParam = new PageParameters();
//Заполняем свойства класса PageParam
            return View(PageParam);
        }
        [HttpPost]
        public ActionResult UserPage(string per_oid, FormCollection frmCollect)
        {
            PageParameters PageParam = new PageParameters();
//Заполняем свойства класса PageParam с учетом значений в frmCollect
            return View(PageParam);
        }
//Контроллер для PartialView
        public ActionResult UserMetrics(PageParameters Params)
        {
            UserMetrics usrMetrics = new UserMetrics();
//Заполняем свойства класса usrMetrics с учетом значений свойств класса Params
            return View("ViewUserMetrics", usrMetrics);
        }

//Контроллер для PartialView
        public ViewResult Detailed(PageParameters Params) 
        {

            MetricsDetails Metrics = new MetricsDetails();
//Заполняем свойства класса Metrics с учетом свойств класса Params
            return View(ViewName, Metrics);
        }
    }
}

@model Mvc3App.Models.PageParameters
@{
    ViewBag.Title = "UserPage";
    Layout = @ViewBag.Layout;
    AjaxOptions ajaxOpt = new AjaxOptions {UpdateTargetId = "detailed"};
}
@using (@Html.BeginForm())
{
    @Html.DropDownList("id", new SelectList(Model.AvlblDates, Model.SelectedDate), new { onchange = "this.form.submit()" })
}
@using (Ajax.BeginForm("Detailed", ajaxOpt))
{ 
    <p id="tabledata">
    @Html.Action("UserMetrics", new { Params = Model })
    </p>
  
    <p id="detailed">
    @Html.Action("Detailed", new { Params = Model }) 
    </p>

}

@model Mvc3App.Models.UserMetrics
@{
    Layout = null;
}
<table align="center" border="1">

@foreach (var item in Model.Strings)
{ 
<tr>
    <td>@Html.RadioButton("Metric", @item.Metric, @item.selected, new { onclick = "this.form.submit()" })</td>
    <td title="@item.Descr">@item.Name</td>
    <td>@item.Volume</td>
    <td>@item.Calc</td>
    <td>@item.ValueCalc</td>
    <td>@item.Value</td>
    <td>@item.ValueGroup</td>
</tr>
}

</table>

@model Mvc3App.Models.MetricsDetails
@{
    Layout = null;
}

<table align="center" border="1">
@foreach (var item in Model.Strings)
{
    <tr class="@item.color">
        <td>@item.inc_id</td>
        <td title = "@item.inc_details">@item.inc_details</td>
        <td>@item.reg_date</td>
        <td>@item.dl_date</td>
        <td>@item.fin_date</td>
    </tr>
}
</table>

AjaxOptions ajaxOpt = new AjaxOptions {
        UpdateTargetId = "dtlt",
        Url = Url.Action("Detailed"
...