Asp.net Mvc EFCfodefirst ürünleri kategoriye göre listeleme?

public PartialViewResult Inndex(int? id)
{
if (id!=null)
{
ViewBag.Kategoriler = id;
var urunlist = ctx.Urunler.Where(x => x.KategoriID == id);
return PartialView(urunlist);
}
else
{
var urunlist = ctx.Urunler.ToList();
return PartialView(urunlist);
}
}

@model IEnumerable<WebApplication6.Urunler>

<table class="table">
    <tr>
    
       
        <th>
            @Html.DisplayNameFor(model => model.UrunAdi)
        </th>
        
        <th>
            @Html.DisplayNameFor(model => model.Fiyat)
        </th>
        
    </tr>

@foreach (var item in Model) {
    <tr>
      
        <td>
            @Html.DisplayFor(modelItem => item.UrunAdi)
        </td>
       
        <td>
            @Html.DisplayFor(modelItem => item.Fiyat)
        </td>
       
    </tr>
}

</table>

 @foreach (Kategoriler ktg in ViewBag.Kategoriler)
            {
                @*@<button class="w3-bar-item w3-button tablink" onclick="openCity(event, @ktg.KategoriID )">@ktg.KategoriAdi</button>*@
                @Html.ActionLink(ktg.KategoriAdi, "Inndex", "Urun", new { id = ktg.KategoriID }, null);

            }