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o software can run free from error, and ASP.NET applications are no exception. Sooner or later your code will be interrupted by a programming mistake, invalid data, unexpected circumstances, or even hardware failure. Novice programmers spend sleepless nights worrying about errors. Professional developers recognize that bugs are an inherent part of software applications and code defensively, testing assumptions, logging problems, and writing errorhandling code to deal with the unexpected. In this chapter, you ll learn the error-handling and debugging practices that you can use to defend your ASP .NET applications against common errors, track user problems, and solve mysterious issues. You ll learn how to use structured exception handling, how to use logs to keep a record of unrecoverable errors, and how to set up web pages with custom error messages for common HTTP errors. You ll also learn how to use page tracing to see diagnostic information about ASP .NET pages.

One thing we have not yet dealt with is what happens to images when a blog post is deleted. As the code currently stands, if a blog post is deleted, any associated images will not be deleted. Because of the foreign key constraint on the blog_posts_images table, the SQL to delete a blog post that has one or more images will fail. We must update the DatabaseObject_BlogPost class so images are deleted when a post is deleted. Doing this is very straightforward, since the instance of DatabaseObject_BlogPost we are trying to delete already has all the images loaded (so we know exactly what needs to be deleted), and it already has a delete callback (we implemented the preDelete() function earlier). This means we can simply loop over each image and call the delete() method.

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The validators you ve added to the different templates are the same as the validators that you added to the examples in 8. You add three RequiredFieldValidator controls to make sure that the user enters all of the required data. You ve used a CompareValidator to ensure the PlayerCost is entered as a valid currency. As we ve already discussed, you need to turn any BoundField controls that you want to validate into TemplateField controls with the correct templates defined. If you don t want to edit a BoundField or have no reason to validate the user s entry, then you can leave it as a BoundField (with the ReadOnly and InsertVisible properties set correctly). In this example, you can leave the PlayerID BoundField as it is. It s already set as ReadOnly, so you can t edit it, and it s also set so that it doesn t appear when you re inserting a Player. The other three BoundField controls are converted to TemplateField controls quite easily (although it can quickly become quite tedious). Once the required templates are added, you can use the design-time features of the DetailsView to configure the validators. By selecting the Edit Templates option, you can use the normal design-time tools to edit the individual templates within the Web control. (If you ve ever had to deal with templates in earlier version of the development tools, you ll appreciate how much of an improvement this actually is.)

ErrorMessage="*Required" ValidationGroup="Group1" runat="server" ControlToValidate="TextBox1" /> <asp:Button ID="Button1" Text="Validate Group1" ValidationGroup="Group1" runat="server" /> </asp:Panel> <br /> <asp:Panel ID="Panel2" runat="server"> <asp:TextBox ID="TextBox2" ValidationGroup="Group2" runat="server" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator2" ErrorMessage="*Required" ValidationGroup="Group2" ControlToValidate="TextBox2" runat="server" /> <asp:Button ID="Button2" Text="Validate Group2" ValidationGroup="Group2" runat="server" /> </asp:Panel> </form> If you click the button in the topmost Panel, only the first text box is validated. If you click the button in the second Panel, only the second text box is validated (as shown in Figure 10-8).

DatabaseObject automatically controls transactions when saving or deleting a record. You can pass false to save() or delete() so transactions are not used. Because a transaction has already been started by the delete() call on the blog post, we must pass false to the delete() call for each image.

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