How to prevent the default behavior of MVC converting String.Empty to null values?

@using Syncfusion.JavaScript.Models
 
@(Html.EJ().Grid<OrdersView>("Grid")
    .AllowPaging()
    .Datasource(ds =>
    {
        ds.URL("/Home/UrlDataSource");
        ds.Adaptor(AdaptorType.UrlAdaptor);
    })
    .AllowFiltering()
    .FilterSettings(filter=>filter.FilterType(FilterType.Excel).BlankValue(""))
    .Columns(col =>
    {
        col.Field("OrderID").HeaderText("Order ID")
            .TextAlign(TextAlign.Right).Add();
        col.Field("EmployeeID").HeaderText("EmployeeID")
            .TextAlign(TextAlign.Right).Add();
        col.Field("Freight").HeaderText("Freight")
            .TextAlign(TextAlign.Right)
            .Format("{0:C}").Add();
        col.Field("CustomerID").HeaderText("Customer ID").Add();
        col.Field("ShipRegion").Type(ColumnType.String).HeaderText("ShipRegion").Add();
    })
)
 

    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult UrlDataSource([ModelBinder(typeof(EmptyStringModelBinder))]DataManager dm)
        {
            IEnumerable DataSource = OrderRepository.GetAllRecords();
            DataOperations ds = new DataOperations();
            if (dm.Where != null && dm.Where.Count > 0)
            {
                DataSource = ds.PerformWhereFilter(DataSource, dm.Where, dm.Where[0].Operator);
            }
            var count = DataSource.Cast<EditableOrder>().Count();
            if ((dm.Skip == 0 || dm.Take == null) && (dm.Take == 0 || dm.Take == null))
                return Json(new { result = DataSource, count = count });
            DataSource = ds.PerformSkip(DataSource, dm.Skip);
            DataSource = ds.PerformTake(DataSource, dm.Take);
            return Json(new { result = DataSource, count = count });
        }
 
        public class EmptyStringModelBinder : DefaultModelBinder
        {
            public override object BindModel(ControllerContext controllerContext,
                                             ModelBindingContext bindingContext)
            {
                bindingContext.ModelMetadata.ConvertEmptyStringToNull = false;
                Binders = new ModelBinderDictionary() { DefaultBinder = this };
                return base.BindModel(controllerContext, bindingContext);
            }
        }
    }