First part

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 ShowProducts()
        {
            From = Products;
            Where.Add(Products.CategoryID.IsEqualTo(2).Or(Products.CategoryID.IsEqualTo(4).Or(Products.CategoryID.IsEqualTo(6))).And(Products.UnitPrice.IsGreaterThan(25)));
        }

        public void Run()
        {
            Execute();
        }

        protected override void OnLoad()
        {
            View = () => new Views.ShowProductsView(this);
        }
    }
} 

Second part

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 ShowProducts()
        {
            From = Products;
-           Where.Add(Products.CategoryID.IsEqualTo(2).Or(Products.CategoryID.IsEqualTo(4).Or(Products.CategoryID.IsEqualTo(6))).And(Products.UnitPrice.IsGreaterThan(25)));
            Where.Add(Products.CategoryID.IsEqualTo(2).Or(Products.CategoryID.IsEqualTo(4).Or(Products.CategoryID.IsEqualTo(6))));
            Where.Add(Products.UnitPrice.IsGreaterThan(25));
        }

        public void Run()
        {
            Execute();
        }

        protected override void OnLoad()
        {
            View = () => new Views.ShowProductsView(this);
        }
    }
} 

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