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ource code can have thousands, hundreds of thousands, or millions of lines of source code, and no single human could keep track of it all. To keep track of all the source code, you need a team of developers, and that means code written by one developer is going to be used and modified by another developer. Since the two developers can t perform a Vulcan mind meld, they must have a well-understood and useful form of communication. But that s just part of the solution. The code itself must be easy to understand. The challenge of writing software is not creating a perfect piece of code, but writing code that can be understood by other developers and used by other pieces of software. The goal isn t to be clever and write software that can do everything, but to write simple, robust, and easy-to-understand software. The keep it simple approach is the best way forward. Having understandable code is particularly important when things go wrong. Your code should generate the appropriate errors. For example, suppose your code relies on a file being present. When the file is not present, your code should generate a clear and distinct error, such as File XYZ is not present and thus I cannot continue. Upon seeing such an error message, another developer would know that he should check whether the file is actually there. This chapter explains exceptions, as errors in an application are technically known, and how to handle them. We ll begin with an overview of how exceptions fit into the structure of a program.

that it can be potentially used against you. After PayPal confirms the payment, you can ship the products to your customer. On each payment, you need to carefully check that the product prices correspond to the correct amounts, because it s very easy for anyone to add a fake product to the shopping cart, or an existing product with a modified price. This can be done simply by fabricating one of those PayPal Add to Cart links and navigating to it.

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An error is when something is not right and could be the result of incorrect data or an incorrect calculation. However, the .NET CLR does not understand errors; it understands only exceptions. For example, if an error is caused by multiplying two numbers rather than adding them, your program will continue to function, but will produce the wrong results. A similar error occurs when a user enters the wrong data the answer will be wrong, but the program will still run. In the case of a serious problem that is beyond the control of the user or that threatens to crash your program, the CLR steps in and treats this as an exception. This halts the program and allows your code to deal with the problem, rather than letting the program crash. (Some would argue that an exception will not halt your entire program, but a thread of your program;

In BalloonShop, you need to add links such as the one shown previously (Add to Cart links) in the product details pages (Product.aspx) (see Figure 10-2), and you need to add the View Cart link on the main web page (so you ll update BalloonShop.master as well). When using shopping cart URLs like PayPal s, you need to control the length of the product names and attributes, although it s unlikely that you ll end up with URLs so long that they can t be handled by web browsers. The page at http://www.boutell.com/newfaq/misc/urllength.html shows an interesting analysis of maximum URL lengths accepted by the most popular web browsers.

Now that you have a basic understanding of what you need to do, let s implement this code through an exercise.

while this is technically true, it s not an important distinction for this introduction to exceptions.) This is called exception handling. To understand how code organization affects exception handling, think of an application as a large corporation. A corporation has a chief executive officer (CEO), then first-level managers, then mid-level managers. Corporations and management within corporations understand that to get anything done, they must develop a game plan and then carry out the game plan. The CEO or highest level manager will know about the overall game plan. The company is organized so that lower-level managers and workers can carry out discrete tasks as defined in the game plan. In other words, these organizational units carry out the implementation of the plan. Translating this to software, your code contains two types of methods: methods that organize the functionality and methods that implement the functionality. You create organizational code so that you have the ability to separate each task from the others. The work of one does not affect the other, and thus the code has been modularized.

1. Edit web.config by adding the following configuration items to the <appSettings> element: <appSettings> <add key="PaypalUrl" value="https://www.paypal.com/cgi-bin/webscr cmd= _cart" /> <add key="PaypalEmail" value="balloon@example.com" /> <add key="PaypalCurrency" value="USD" /> <add key="PaypalReturnUrl" value="http://www.example.com" /> <add key="PaypalCancelUrl" value="http://www.example.com" /> ... </appSettings>

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