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To begin this chapter s example, get a piece of paper and a pen or pencil, or you can use a tablet PC for writing, if you have one. Next, in the center of the paper (or virtual paper), draw a circle and in it write the word Calculator. Now stop and think about what a calculator means with respect to the software that you will be writing. Write those ideas on the paper surrounding the circle. My thoughts are shown in Figure 2-1.

At this moment, you can test all kinds of keyword-rich URLs that are currently known by your web site: department pages and subpages, category pages and subpages, the front page and its subpages, and product details links. Note, however, that the links currently generated by your web site are still old, dynamic URLs. Updating the links in your site will be the subject of the next exercise.

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Figure 2-1. Brainstorming what the calculator application represents Your thoughts and my thoughts may or may not be the same, but what our results will have in common is a hodgepodge of ideas everywhere. Figure 2-1 illustrates that one of the biggest problems software developers face is lack of focus and organization. It is not that developers can t focus or organize, but that developers are bombarded by information, and it is a Herculean task to keep track of, let alone organize, all of that information. But software projects that are successful must remain focused and organized. Therefore, the next step is to focus and organize your thoughts, which results in something like Figure 2-2.

The core of the functionality you ve just implemented lies in the rewriting rules you ve added to the <rewriter> element in web.config. The first rewrite rule you ve written is also the simplest: <rewrite url="^.*-d([0-9]+)/ $" to="~/Catalog.aspx DepartmentID=$1" processing="stop" /> As you can see, the rule is expressed by an element with three attributes: url describes the incoming URLs that should be rewritten. to represents the rewritten URL. processing is an optional parameter that makes the parser stop reading further rewrite rules in case this one matches. The url attribute contains a regular expression that describes the URLs the rewrite rule should match. We ll discuss regular expressions in a second for now, let s just assume that the regular expression from the rule above ^.*-d([0-9]+)/ $ matches strings of the following form, where N is a number: Some-text-here-dN/ You can see the resemblance between this string and the URL of a keyword-rich department page: http://www.example.com/Balloons-for-Children-d2/ The rewrite rule extracts the matched number N and saves it to a variable named $1, which is then used in the to part of the rewrite rule to compose the rewritten URL. The to part looks like this: to="~/Catalog.aspx DepartmentID=$1" When $1 is replaced by the ID of the Balloons for Children department, which is 2, to becomes the dynamic URL of the department: ~/Catalog.aspx DepartmentID=2 ASP.NET interprets the ~ as the root of your project, so this link will point to the Catalog.aspx file, located in your project s root folder. Admittedly this was a very superficial description of how URL rewriting works but we ll get back to it soon, after we talk a little bit about regular expressions.

In Figure 2-2, the ideas are organized by classification. As this is book is about a programming language, the only relevant ideas are those related to source code functionality. Roughly speaking, in the source code category, each thought corresponds to a feature to implement.

Regular expressions are one of those topics that programmers tend to either love or hate A regular expression, commonly referred to as regex, is a text string that uses a special format to describe a text pattern Regular expressions are used to define rules that match or transform groups of strings, and they represent one of the most powerful text manipulation tools available today Find a few details about them at the Wikipedia page at http://enwikipediaorg/wiki/ Regular_expression Regular expressions are particularly useful in circumstances when you need to manipulate strings that don t have a well-defined format (as XML documents have, for example) and cannot be parsed or modified using more specialized techniques.

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