public class OrdersLoadParser : ILoadParser<OrdersAlertItem>
    {
        public OrdersAlertItem ParceFrom(object item)
        {
            var dr = item as DataRow;
            if (dr == null || dr.GetType() != typeof(DataRow)) throw new ArgumentException("item");

            return new OrdersAlertItem(dr);
        }

        public Type GetAlertType()
        {
            return typeof(OrdersAlertItem);
        }
    }

    
    public class OrdersLoadParser<T> : ILoadParser<T> 
         where T: IAlertItem
         where : new(DataRow)
    {
        public T ParceFrom(object item)
        {
            var dr = item as DataRow;
            if (dr == null || dr.GetType() != typeof(DataRow)) throw new ArgumentException("item");

            return new T(dr);
        }

        public Type GetAlertType()
        {
            return typeof(T);
        }
    }