Exercise - result

The ShowProducts class should look like :

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using Firefly.Box;
using ENV;
using ENV.Data;

namespace Northwind.Exercises
{
    public class ShowProducts : UIControllerBase
    {

        public readonly Models.Products Products = new Models.Products();
        public readonly Models.Categories Categories = new Models.Categories();

        public ShowProducts()
        {
            From = Products;
            Relations.Add(Categories, RelationType.Find,
                Categories.CategoryID.IsEqualTo(Products.CategoryID));

            Where.Add(Products.CategoryID.IsEqualTo(2).Or(Products.CategoryID.IsEqualTo(4).Or(Products.CategoryID.IsEqualTo(6))));
            Where.Add(Products.UnitPrice.IsGreaterThan(25));

            OrderBy = Products.SortByProductName;
        }

        public void Run()
        {
            Execute();
        }

        protected override void OnLoad()
        {
            View = () => new Views.ShowProductsView(this);
        }
        protected override void OnSavingRow()
        {
            if (Products.ProductName =="")
                System.Windows.Forms.MessageBox.Show("Take notice : Product name is empty!");

            if (Products.UnitsInStock==0 || Products.UnitsOnOrder==0)
                System.Windows.Forms.MessageBox.Show("Take notice : Units in stock or Units on order is equal to zero");
        }
    }
} 

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