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Errors can occur in a variety of situations. Some of the most common causes of errors include attempts to divide by zero (usually caused by invalid input or missing information) and attempts to connect to a limited resource such as a file or a database (which can fail if the file doesn t exist, the database connection times out, or the code has insufficient security credentials). One infamous type of error is the null reference exception, which usually occurs when a program attempts to use an uninitialized object. As a .NET programmer, you ll quickly learn to recognize and resolve this common but annoying mistake. The following code example shows the problem in action, with two SqlConnection objects that represent database connections: // Define a variable named conOne and create the object. private SqlConnection conOne = new SqlConnection(); // Define a variable named conTwo, but don't create the object. private SqlConnection conTwo; public void cmdDoSomething_Click(object sender, EventArgs e) {

// This works, because the object has been created // with the new keyword. conOne.ConnectionString = "..."; ... // The following statement will fail and generate a // null reference exception. // You cannot modify a property (or use a method) of an // object that doesn't exist! conTwo.ConnectionString = "..."; ... } When an error occurs in your code, .NET checks to see whether any error handlers appear in the current scope. If the error occurs inside a method, .NET searches for local error handlers and then checks for any active error handlers in the calling code. If no error handlers are found, the page processing is aborted and an error page is displayed in the browser. Depending on whether the request is from the local computer or a remote client, the error page may show a detailed description (as shown in Figure 8-1) or a generic message. You ll explore this topic a little later in the Error Pages section of this chapter.

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Many of today s web-based applications are variations upon a common theme: reading and writing data to a database. Armed with the (simple) domain layer, the application now needs a way to access a persistent database so each Product s properties can read from and write to a database. The Data Access Object1 (DAO) pattern is a common Java EE pattern for accessing databases. The DAO pattern is used to abstract and encapsulate all access to the database. A well-designed DAO will completely encapsulate the inner workings of how it actually connects to a database, and it should only expose a public API that describes the DAO s available operations. A DAO that accesses a relational database should not expose any of the low-level details regarding the relational database to its clients; instead, it should only expose methods that describe what should be done, such as findProducts or updateProductPrice.

Even if an error is the result of invalid input or the failure of a third-party component, an error page can shatter the professional appearance of any application. The application users end up with a feeling that the application is unstable, insecure, or of poor quality and they re at least partially correct. If an ASP .NET application is carefully designed and constructed, an error page will almost never appear. Errors may still occur because of unforeseen circumstances, but they will be caught in the code and identified. If the error is a critical one that the application cannot solve on its own, it will report a more useful (and user-friendly) page of information that might include a link to a support e-mail or a phone number where the customer can receive additional assistance. You ll look at those techniques in this chapter.

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