Display the data of the table according to the field name chosen on a combobox list.

<table>
    <tr>
        <th>Nom</th>
        <th>Marque</th>
        <th>Model</th>
        <th>Nuemro</th>
        <th>Plage</th>
    </tr>
    @foreach (var item in ((List
     <site>
         )TempData["listesite"]).GroupBy(x => x.Nom))
    {
        <tr>
            <th>@item.Key</th>
            <th colspan="4"></th>
        </tr>
        foreach (var data in ((List<site>
      )TempData["listesite"]).Where(x => x.Nom == item.Key))
        {
            <tr>
                <td></td>
                <td>@data.Marque</td>
                <td>@data.Model</td>
                <td>@data.Numero_serie</td>
                <td>@data.Plage</td>
            </tr>
        }
    }
</table>

public ActionResult Index()
   {
       TestEntities db = new TestEntities();
       TempData["listesite"] = db.Sites.ToList();
       return View();
   }