Exercise - Flow Parameters result

Your FlowProducts class should look like :

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

namespace Northwind.Exercises
{
    public class FlowProducts : FlowUIControllerBase
    {

        public readonly Models.Products Products = new Models.Products();
        public readonly Models.Categories Categories = new Models.Categories();
 
        public FlowProducts()
        {
            From = Products;
            Relations.Add(Categories, RelationType.Find,
                Categories.CategoryID.IsEqualTo(Products.CategoryID));
 
            Columns.Add(Products.ProductID);
-           Flow.Add(()=>MessageBox.Show("Category name is "+Categories.CategoryName));
            Flow.Add(()=>MessageBox.Show("Category name is "+Categories.CategoryName), FlowMode.Tab,Direction.Backward);
            Columns.Add(Products.ProductName);
            Columns.Add(Products.CategoryID);
            Flow.Add(() => ENV.Message.ShowError("CategoryID can not be equal to zero"), () => Products.CategoryID == 0,Direction.Forward);
            Columns.Add(Products.UnitPrice);
            Columns.Add(Products.UnitsInStock);
            Columns.Add(Products.UnitsOnOrder);
            Columns.Add(Categories.CategoryID);
            Columns.Add(Categories.CategoryName);
        }

        public void Run()
        {
            Execute();
        }

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

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