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Not all the functionality of the component is used in this page. For example, the page doesn t use the AddCategory() method or the version of GetItems() that doesn t require a category number. This is completely normal. Other pages may use different features from the component. The code for the web page is free of data access code. It does, however, need to understand how to use a DataSet, and it needs to know specific field names to create a more attractive GridView with custom templates for layout (instead of automatically generated columns). The page could be improved with error handling code or validation controls. As it is, no validation is performed to ensure that the price is numeric or even to ensure that the required values are supplied.

In this chapter, we ve covered some of the principles of e-commerce in the real, hostile world where it s important to focus on short-term revenue and keep risks down. We ve discussed the three basic motivations for taking your business online: Acquiring more customers Making customers spend more Reducing the costs of fulfilling orders We ve shown you how to apply those principles to a three-phase plan that provides a deliverable, usable site at each stage. We ll continue to expand on this plan throughout the book. At this point, you ve presented your plan to the owners of the balloon shop. In the next chapter, you ll put on your programming hat, and start to design and build your web site (assuming you get the contract, of course).

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One way you could enhance the component is with better support for error reporting. As it is, any database errors that occur are immediately returned to the calling code. In some cases (for example, if there is a legitimate database problem), this is a reasonable approach, because the component can t handle the problem. However, the component fails to handle one common problem properly. This problem occurs if the connection string isn t found in the web.config file. Though the component tries to read the connection string as soon as it s created, the calling code doesn t realize a problem exists until it tries to use a database method. A better approach is to notify the client as soon as the problem is detected, as shown in the following code example:

Returns the number of columns in the current row Returns true if the DataReader contains any rows Returns true if the DataReader is closed Returns the contents of a column in a row*

Public Class DBUtil Private connectionString As String Public Sub New() If WebConfigurationManager.ConnectionStrings("AdBoard") _ Is Nothing Then Throw New ApplicationException( _ "Missing ConnectionString variable in web.config.") Else connectionString = _ WebConfigurationManager.ConnectionStrings( _ "AdBoard").ConnectionString End If End Sub

ow that you ve convinced the client that you can create a cool web site to complement the client s store activity, it s time to stop celebrating and start thinking about how to put into practice all the promises made to the client. As usual, when you lay down on paper the technical requirements you must meet, everything starts to seem a bit more complicated than initially anticipated.

This code throws an ApplicationException with a custom error message that indicates the problem. To provide even better reporting, you could create your own exception class that inherits from ApplicationException, as described in 11.

* Never use Item by name. Instead, this is used in the background to access DataReader columns with, for instance, myReader["columnname"].

If you re debugging your code in Visual Studio, you ll find you can single-step from your web page Tip code right into the code for the component, even if it isn t a part of the same solution. The appropriate source code file is loaded into your editor automatically, as long as it s available (and you ve compiled the component in debug mode).

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