columns.Bound(c => c.Category).HtmlAttributes(new { @class="templateCell"}).ClientTemplate(
                Html.Kendo().DropDownList().Name("ddl#=OrderID#")
                .DataValueField("CategoryId")
                .DataTextField("CategoryName")
                .HtmlAttributes(new { data_bind="value: Category"})
                .BindTo(new List<Category>() { new Category() { CategoryId=1, CategoryName="Name1"},
                 new Category() { CategoryId=2, CategoryName="Name2"}
                })
                .ToClientTemplate().ToHtmlString()
                ).Width(100);
            columns.Command(c => c.Edit());

.Events(ev => ev.DataBound("bindRowToDataItem"))

<script>
    function bindRowToDataItem(e) {
        var grid = e.sender;
        $(".templateCell").each(function () {
            eval($(this).children("script").last().html());
            var row = $(this).closest("tr");
            var dataItem = grid.dataItem(row);
            kendo.bind($(row), dataItem);
        });
    }
</script>