Cascading using binding to Parent:<br />
<%:Html.Awe().AjaxDropdown("Category")
             .Url(Url.Action("GetCategories","Home")) %>

<%:Html.Awe().AjaxDropdown("ChildMeal")
                .Url(Url.Action("GetMeals","Home"))
                .Parent("Category") %>

public ActionResult GetCategories(int? v)
{
    var items = Db.Categories
        .Select(o => new SelectableItem(o.Id, o.Name, v == o.Id));// value, text, selected
    return Json(items);
}

public ActionResult GetMeals(int? v, int? parent)
{
    var items = Db.Meals.Where(o => o.Category.Id == parent)
        .Select(o => new SelectableItem(o.Id, o.Name, v == o.Id));// key, text, selected
    return Json(items);
}

<div>
    <div class="efield awe-il"><%:Html.Awe().TextBox("txtperson").Placeholder("search for person ...").CssClass("searchtxt") %></div>
    <div class="efield awe-il"><%:Html.Awe().TextBox("txtfood").Placeholder("search for food ...").CssClass("searchtxt") %></div>
</div>
<%:Html.Awe().Grid("Grid1")
            .Columns(
                new Column{Name = "Id", Width = 55, Groupable = false, Resizable = false},
                new Column{Name = "Person"},
                new Column{Name = "Food"},
                new Column{Name = "Location"},
                new Column{Name = "Date", Width = 120},
                new Column{Name = "Country.Name", ClientFormat = ".CountryName", Header = "Country"},
                new Column{Name = "Chef.FirstName,Chef.LastName", ClientFormat = ".ChefName", Header="Chef"})
            .Url(Url.Action("GetItems", "LunchGrid"))
            .Persistence(Persistence.View) // save collapsed groups and nodes when switching between grid pages
            .ColumnsPersistence(Persistence.Session) // save columns (width, grouping, etc..) for browser session lifetime
            .Resizable(true)
            .Height(300)
            .PageSize(10)
            .Parent("txtperson","person")
            .Parent("txtfood","food")
%>

public class LunchGridController : Controller
{
    public ActionResult GetItems(GridParams g, string person, string food)
    {
        food = (food ?? "").ToLower();
        person = (person ?? "").ToLower();

        var list = Db.Lunches
            .Where(o => o.Food.ToLower().Contains(food) && o.Person.ToLower().Contains(person))
            .AsQueryable();

        return Json(new GridModelBuilder<Lunch>(list, g)
            {
                Key = "Id", // needed for Entity Framework | nesting | tree
                Map = o => new
                {
                    o.Id,
                    o.Person,
                    o.Food,
                    o.Location,
                    o.Price,
                    o.Date,
                    CountryName = o.Country.Name,
                    ChefName = o.Chef.FirstName + " " + o.Chef.LastName
                }
            }.Build());
    }
}

<%:Html.Awe().InitPopupForm()
            .Name("createPurchase")
            .Group("purchase")
            .Url(Url.Action("Create","GridCrudDemo"))
            .Success("itemCreated('PurchasesGrid')")%>

<%:Html.Awe().InitPopupForm()
            .Name("editPurchase")
            .Group("purchase")
            .Url(Url.Action("Edit", "GridCrudDemo"))
            .Success("itemUpdated('PurchasesGrid')")%>

<%:Html.Awe().InitPopupForm()
            .Name("deletePurchase")
            .Url(Url.Action("Delete", "GridCrudDemo"))
            .Success("itemDeleted('PurchasesGrid')")
            .Parameter("gridId", "PurchasesGrid") // the confirm dialog uses it to emphasize the row
            .Height(200)
            .Modal(true)%>


<div class="bar">
    <div style="float: right;">
        <%:Html.Awe().TextBox("txtSearch").Placeholder("search...").CssClass("searchtxt") %>
    </div>
    <button type="button" onclick="awe.open('createPurchase')" class="awe-btn">Create</button>
</div>
<%:Html.Awe().Grid("PurchasesGrid")
       .Url(Url.Action("GridGetItems","GridCrudDemo"))
       .Parent("txtSearch","search")
       .Height(350)
       .Columns(
           new Column{Name = "Id", Width = 55, Groupable = false},
           new Column{Name="Customer"},
           new Column{Name="Product"},
           new Column{Name="Quantity", Width = 100},
           new Column{Name="Date", Width = 100},
           new Column{ClientFormat = Utils.EditFormat("editPurchase"), Width = 50},
           new Column{ClientFormat = Utils.DeleteFormat("deletePurchase"), Width = 50 })%>
<%-- 
// these are generic/reusable, not specific to this Grid, 
// so you can put them in your Site.js and use them all over your app
// they are used by the PopupForm helpers and executed when PopupForm form submit succeeds--%>
<script type="text/javascript">
    function itemDeleted(gridId) {
        return function (res) {
            var $grid = $("#" + gridId);
            $grid.data('api').select(res.Id)[0].fadeOut(500, function () {
                $(this).remove();
                if (!$grid.find('.awe-row').length) $grid.data('api').load();
            });
        };
    }

    function itemUpdated(gridId) {
        return function (item) {
            var api = $('#' + gridId).data('api');
            var xhr = api.update(item.Id);
            $.when(xhr).done(function () {
                var $row = api.select(item.Id)[0];
                var altcl = $row.hasClass("awe-alt") ? "awe-alt" : "";
                $row.switchClass(altcl, "awe-changing", 1).switchClass("awe-changing", altcl, 1000);
            });
        };
    }

    function itemCreated(gridId) {
        return function (item) {
            var $grid = $("#" + gridId);
            var $row = $grid.data('api').renderRow(item);
            $grid.find(".awe-tbody").prepend($row);
            $row.addClass("awe-changing").removeClass("awe-changing", 1000);
        };
    }
</script>

public class GridCrudDemoController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult GridGetItems(GridParams g, string search)
    {
        search = (search ?? "").ToLower();
        var list = Db.Purchases.Where(o => o.Customer.ToLower().Contains(search) || o.Product.ToLower().Contains(search));

        return Json(new GridModelBuilder<Purchase>(list.OrderByDescending(o => o.Id).AsQueryable(), g)
        {
            Key = "Id", // needed for api select, update, tree, nesting, EF
            GetItem = () => Db.Get<Purchase>(Convert.ToInt32(g.Key))
        }.Build());
    }

    public ActionResult Delete(int id, string gridId)
    {
        var purchase = Db.Get<Purchase>(id);
        
        return View(new DeleteConfirmInput 
        { 
            Id = id, 
            GridId = gridId,
            Message = string.Format("Are you sure you want to delete purchase {0} of customer {1}", purchase.Id, purchase.Customer) 
        });
    }

    [HttpPost]
    public ActionResult Delete(DeleteConfirmInput input)
    {
        Db.Delete<Purchase>(input.Id);
        return Json(new { input.Id });
    }

    public ActionResult Edit(int id)
    {
        var o = Db.Get<Purchase>(id);
        var input = new PurchaseInput
            {
                Customer = o.Customer,
                Product = o.Product,
                Date = o.Date,
                Quantity = o.Quantity
            };

        return View(input);
    }

    [HttpPost]
    public ActionResult Edit(PurchaseInput input)
    {
        if (!ModelState.IsValid) return View(input);

        var o = Db.Get<Purchase>(input.Id);
        o.Customer = input.Customer;
        o.Date = input.Date.Value;
        o.Product = input.Product;
        o.Quantity = input.Quantity;
        Db.Update(o);
        return Json(o);
    }

    public ActionResult Create()
    {
        return View("Edit");
    }

    [HttpPost]
    public ActionResult Create(PurchaseInput input)
    {
        if (!ModelState.IsValid) return View("Edit", input);
        var o = new Purchase
            {
                Customer = input.Customer,
                Date = input.Date.Value,
                Quantity = input.Quantity,
                Product = input.Product
            };
        Db.Insert(o);
        return Json(o);
    }
}