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For this final SportsStore chapter, your key goal will be to give site administrators a way of updating their product catalog. In this chapter, you ll learn the following: How to let users edit a collection of items (creating, reading, updating, and deleting items in your domain model), validating each submission How to use Forms Authentication and filters to secure controllers and action methods, presenting suitable login prompts when needed How to receive file uploads How to display images that are stored in your SQL database

By now, you ve seen a lot of unit test code, and will have a sense of how TDD can work for an ASP.NET MVC application. Unit testing continues throughout this chapter, but from now on it will be more concise. In cases where unit test code is either very obvious or very verbose, I ll omit full listings or just highlight the key lines. You can always obtain the test code in full from this book s downloadable code samples (available from the Source Code page on the Apress web site, at www.apress.com/).

These code snippets can be added to your Common folder in the My Snippets subfolder. (D:\Projects\ Common\Templates\My Snippets). After they are in place, you can set up Visual Studio to reference them to be used in all your projects.

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Note We will use the tag CLOM in our references so that it will be clear when we are utilizing elements of the client object model and when we are utilizing other .NET elements that could be named similarly.

The usual software convention for managing collections of items is to present the user with two types of screens: list and edit (Figure 6 1). Together, these allow a user to create, read, update, and delete items in that collection. (Collectively, these features are known by the acronym CRUD.)

Figure 6 1. Sketch of a CRUD UI for the product catalog CRUD is one of those features that web developers have to implement frequently so frequently, in fact, that Visual Studio tries to help by offering to automatically generate CRUD-related controllers and view templates for your custom model objects.

The examples shown through the rest of this chapter use a database holding two tables, Person and Location, as shown in Figure 2-3. Each record in the Person table references a record in the Location table with a foreign key constraint. A random and significantly sized set of data is then loaded into the Person table to allow for a distribution of values across the three columns: FirstName, LastName, and BirthDate. The foreign key reference is LocationId.

Note In this chapter, we ll use Visual Studio s built-in templates occasionally. However, in most cases we ll edit, trim back, or entirely replace the automatically generated CRUD code, because we can make it much more concise and better suited to our task. After all, SportsStore is supposed to be a fairly realistic application, not just demoware specially crafted to make ASP.NET MVC look good.

We will want to set the lblTasks Label to have no content on page load so that values left over between post-backs of the Button click will not remain. Add the following code to the Page load event:

Let s implement a simple CRUD UI for SportsStore s product catalog. Rather than overburdening ProductsController, create a new controller class called AdminController (right-click the /Controllers folder and choose Add Controller).

Note I made the choice to create a new controller here, rather than simply extend ProductsController, as a matter of personal preference. There s actually no limit to the number of action methods you can put on a single controller. As with all object-oriented programming, you re free to arrange methods and responsibilities any way you like. Of course, it s preferable to keep things organized, so think about the single responsibility principle and break out a new controller when you re switching to a different segment of the application.

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