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fter learning about the three-tier architecture and implementing a bit of your web site s main page, you re ready to start creating the BalloonShop product catalog. Because the product catalog is composed of many components, you ll create it over two chapters. In this chapter you ll create the first database table, create the first stored procedure, implement generic data access code, learn how to handle errors and email their details to the administrator, and finally use data gathered from the database to compose dynamic content for your visitor. The main topics we ll touch on in this chapter are: Analyzing the structure of the product catalog and the functionality it should support Creating the database structures for the catalog and the data tier of the catalog Implementing the business tier objects required to make the catalog run, and putting a basic but functional error-handling strategy in place Implementing a functional UI for the product catalog

try { throw new Exception("Exception in action 2.4."); } catch (Exception thrown) { throw new Exception("Exception in action 2 has been caught"); } The results are not as enlightening: Unhandled Exception: System.Exception: Exception in action 2 has been caught. If you want to gain access to the error string, you can use the Message property of an exception. try { throw new Exception("Exception in action 2.4."); } catch (Exception thrown) { Console.WriteLine(thrown.Message); throw new Exception("Exception in action 2 has been caught."); } You still have the more specific message, but not as part of the flow of exceptions: Exception in action 2.4. Unhandled Exception: System.Exception: Exception in action 2 has been caught.

In this exercise, you will use Solver to determine a target home sales price. This exercise s data is on the Solver Try It Exercises.xls workbook s Home Sales worksheet, shown in Figure 4-24.

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One of the essential features required in any e-store is to allow the visitor to easily browse through the products. Just imagine what Amazon.com would be like without its excellent product catalog! Whether your visitors are looking for something specific or just browsing, it s important to make sure their experience with your site is a pleasant one. After all, you want your visitors to find what they are looking for as easily and painlessly as possible. This is why you ll want to add search functionality to the site and also find a clever way of structuring products into categories so they can be quickly and intuitively accessed. Depending on the size of the store, it might be enough to group products under a number of categories, but if there are a lot of products, you ll need to find even more ways to categorize them. Determining the structure of the catalog is one of the first tasks to accomplish in this chapter. Keep in mind that using a professional approach, these details would have been established before starting to code, when building the requirements document for the project. However, for the purposes of this book, we prefer to deal with things one at a time.

After the structure of the catalog is established, you ll start writing the code that makes the catalog work as planned.

When you throw exceptions, make sure that you don t use the same error message twice. Imagine the situation where you deliver a program into production and the error message File not found is generated. If this text is used in multiple places, when the user calls tech support, the support staff will have no idea which file was not found. Instead, in the error message, tell the user which file was not found and why. The more details you deliver, the easier it is for the support desk to help users get around the problem. If you do need to use the same text in multiple places, add a context identifier. For example, you could generate a load error fault in the context of loading a file using a dialog box. Or you could generate a load error in the context of loading a file based on a command-line argument. Specify each context as an additional piece of information appended or prefixed to the exception text, much like the previous code illustrated when catching an exception in action 2.

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