public ActionResult ValiderSpecimen(int? id)
    {
        bool valide = Convert.ToBoolean(myDataBase.Specimen.First(e => e.IdSpecimen == id).valide);
        if (valide)
        {
            List<Milieu> mil = myDataBase.Milieu.ToList();


            return PartialView("AfficherMilieuxEtud",mil);
        }
        return View();
    }

<div class="container">
    <div class="row">
        @foreach (var item in Model)
        {
            <div class="col-md-4">

                <div class="panel panel-info">
                    <a onmouseover="panel1.style.background='#ccb3ff'" onmouseout="panel1.style.background='#D9EDF6'" data-ajax="true" data-ajax-method="post" data-ajax-mode="replace" data-ajax-update="#result" href="@Url.Action("ValiderSpecimen", "Home",new { id= ViewBag.item1.IdSpecimen })">
                        <div id="" class="panel-heading" style="background-color:#D9EDF6;"><img src="~/ImageNav/mil.png" style="width:30px;color:dodgerblue;" /></div>
                    </a>
                    <table class="table table-hover" style="width:100%" ;>
                        <tr>
                            <td>Nom du milieu</td>
                            <td>@Html.DisplayFor(modelItem => item.nomMilieu)</td>
                        </tr>
                    </table>
                </div>
            </div>
        }
    </div>
</div>