public ActionResult Export(string searchString, int searchOrder = 0)
{
    var user = from m in db.Orders select m;

    if (!String.IsNullOrEmpty(searchString))
    {
        user = user.Where(s => s.ClientID.Contains(searchString));
    }

    Response.AddHeader("Content-Type", "application/vnd.ms-excel");
    return this.View(user);
}

@model IEnumerable<MyApp.Models.Order>

@{
    ViewBag.Title = "Index";
}

<h2>Orders Historic</h2>

<div id="orderDiv">
@using (Html.BeginForm("Export", "Historic", FormMethod.Get))
{
            <p>
        Generate Order with ClientID :&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
         @Html.TextBox("searchString")

        <input type="submit" value="GENEREMOI" />
        </p>
}
</div>

@model IEnumerable<KrysGroup.Models.Order>

    <table cellpadding="3" cellspacing="3">
        <tr>
            <td width="12%" align="center">
                Client Name/ID
            </td>
            <td width="15%" align="center">
                N° Order
            </td>

            OTHER TD....

        </tr>

@foreach (var item in Model)
{
      TimeSpan result = DateTime.Now - item.OrderDate;

      if (result.Days < 31)
      {
            <tr border="1" bgcolor="@Odd">
               <td> @Html.DisplayFor(modelItem => item.Username) </td>
               <td> @Html.DisplayFor(modelItem => item.OrderId) </td>
                <td>
                    <ul style="list-style-type:none; padding:0; margin:0">
                        @if (item.OrderDetails != null)
                        {
                            foreach (var o in item.OrderDetails)
                            {
                                if (o.Pack == null)
                                {
                                    <li>  @Html.DisplayFor(modelItem => o.Product.Name)  </li>
                                }
                                else
                                {
                                    <li> <text>Pack</text>  @Html.DisplayFor(modelItem => o.Pack.Name)  </li>
                                }
                            }
                        }
                    </ul>
                </td>

                OTHER TD...
 </table>

@Ajax.ActionLink("Name", "NameOfTheAction", "NameOfTheController",
                                   new { id = itemId },
                                   new AjaxOptions { HttpMethod = "Get", UpdateTargetId = "divInMainView", OnSuccess = "Do Something (js)" },
                                    new { html-props })