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familiar with this ingredient, there s no reason to keep repeating it. In the rest of this book, the doctype is left out of the web page markup to save space. Of course, you ll still see it if you download the sample code.

Once you have implemented this template, you will now be able to view a blog post as well as have links to all the months in your blog. This is shown in Figure 9-3.

the Player was entered correctly. However, you used a RegularExpressionValidator rather than a CompareValidator, simply because it demonstrated another type of validator.

The currency list can now be filled using code at runtime. In this case, the ideal event is the Page.Load event, because this is the first event that occurs when the page is executed. Here s the code you need to add to the CurrencyConverter page class: protected void Page_Load(Object sender, EventArgs e) { if (this.IsPostBack == false) { Currency.Items.Add("Euro"); Currency.Items.Add("Japanese Yen"); Currency.Items.Add("Canadian Dollar"); } }

The next step is to create a page that displays all posts for a single month. This is the page that the links generated in Listing 9-22 link to. To do this, we will implement the archiveAction() method of UserController. This is the method used by the archive route we created earlier in this chapter.

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The RegularExpressionValidator allows you to check that the value entered matches a specific regular expression by setting the ValidationExpression property to the regular expression you want to use. Any valid regular expression can be used, and Visual Web Developer provides you with several standard ones (an e-mail address and Web address, for instance). You re checking that the entered value is a decimal, so you need to define your own regular expression as follows: ^\d+(\.\d\d) A decimal is any number of digits followed by a decimal point, then two decimal digits.

This example illustrates two important points: You can use the Items property to get items in a list control. This allows you to append, insert, and remove <option> elements (which represent the items in the list). Remember, when generating dynamic content with a server control, you set the properties, and the control creates the appropriate HTML tags. Before adding any items to this list, you need to make sure this is the first time the page is being served to this particular user. Otherwise, the page will continuously add more items to the list or inadvertently overwrite the user s selection every time the user interacts with the page. To perform this test, you check the IsPostBack property of the current Page. In other words, IsPostback is a property of the CurrencyConverter class, which CurrencyConverter inherits from the generic Page class. If IsPostBack is false, the page is being created for the first time, and it s safe to initialize it.

Of course, if you re a veteran HTML coder, you know that a select list also provides a value attribute that you can use to store a value for each item in the list. Because the currency converter uses a short list of hard-coded currencies, this is an ideal place to store the currency conversion rate. To set the value tag, you need to create a ListItem object for every item in the list and add that to the HtmlSelect control. The ListItem class provides a constructor that lets you specify the text and value at the same time that you create it, thereby allowing condensed code like this:

The archiveAction() method that we use to display all the posts for a single month is somewhat trivial to implement. All of the pieces are already in place to retrieve this data (DatabaseObject_BlogPost::GetPosts()) and to display it (the blog-post-summary.tpl template) we just now need to glue the pieces together.

Tip A good place to look for regular expressions that meet your requirements is http://www. regexlib.com. Also refer to Regular Expression Recipes for Windows Developers: A Problem-Solution Approach by Nathan A. Good (1-59059-497-5; Apress, 2005).

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