How do I use DISTINCT inside a MVC view ? !

@model Northwind.Employee

@{
    ViewBag.Title = "Details";
    Layout = "~/Views/Shared/MasterDetailsLayoutPage.cshtml";
}

<h2>Details</h2>

<div>
    <h4>Employee</h4>
    <hr />
    <dl class="dl-horizontal">
        <dt>
            @Html.DisplayNameFor(model => model.LastName)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.LastName)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.FirstName)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.FirstName)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Title)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Title)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.TitleOfCourtesy)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.TitleOfCourtesy)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.BirthDate)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.BirthDate)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.HireDate)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.HireDate)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Address)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Address)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.City)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.City)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Region)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Region)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.PostalCode)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.PostalCode)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Country)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Country)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.HomePhone)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.HomePhone)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Extension)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Extension)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Photo)
        </dt>

        <dd>
            @{

                byte[] photo = Model.Photo;
                string imageSrc = "image / jpeg";
                if (photo != null)
                {

                    MemoryStream ms = new MemoryStream();
                    ms.Write(photo, 78, photo.Length - 78);
                    string imageBase64 = Convert.ToBase64String(ms.ToArray());
                    imageSrc = string.Format("data:image/jpeg;base64,{0}", imageBase64);


                }
            }

            <img src="@imageSrc" alt="Image"  width="50" height="50"/>
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Notes)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Notes)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.PhotoPath)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.PhotoPath)
        </dd>

        <dt>
            @Html.DisplayNameFor(model => model.Employee1.LastName)
        </dt>

        <dd>
            @Html.DisplayFor(model => model.Employee1.LastName)
        </dd>

    </dl>
</div>


<h4>Customers</h4>
<p>
    @Html.ActionLink("Create New Customer", "Create", "Customers", new { id = Model.EmployeeID }, null)
</p>
<table class="table">
    <tr>
        <th>
            Customer ID
        </th>
        <th>
            Customer Name
        </th>

        <th></th>
    </tr>
    
    @foreach (var item in Model.Orders.Distinct<Order>())
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.CustomerID)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Customer.ContactName)
            </td>

            <td>
                @Html.ActionLink("Editt   ", "Edit", "Customers", new { id = item.CustomerID }, null)


                @Html.ActionLink("Detailss     ", "Details", "Customers", new { id = item.CustomerID }, null)


                @Html.ActionLink("Deletee    ", "Delete", "Customers", new { id = item.CustomerID }, null)


                @Html.ActionLink("Edit", "Edit", new { id = item.CustomerID }) |
                @Html.ActionLink("Details", "Details", new { id = item.CustomerID }) |
                @Html.ActionLink("Delete", "Delete", new { id = item.CustomerID })
            </td>
        </tr>
    }

</table>







<p>
    @Html.ActionLink("Edit", "Edit", new { id = Model.EmployeeID }) |
    @Html.ActionLink("Back to List", "Index")
</p>

public ActionResult Details(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Employee employee = db.Employees.Find(id);
            if (employee == null)
            {
                return HttpNotFound();
            }
            return View(employee);
        }

@foreach (var item in Model.Orders.Distinct<Order>())
   {