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' Find the corresponding input control, and change the ' generic Control variable into a TextBox variable. ' This allows access to the Text property. Dim ctrlInput As TextBox = CType( _ Me.FindControl(ctrl.ControlToValidate), TextBox) ErrorMessage &= " * Problem is with this input: " ErrorMessage &= ctrlInput.Text & "<br />" End If Next lblMessage.Text = ErrorMessage End Sub This example uses an advanced technique: the Page.FindControl() method. It s required because the ControlToValidate property of each validator simply provides a string with the name of a control, not a reference to the actual control object. To find the control that matches this name (and retrieve its Text property), you need to use the FindControl() method. Once the code has retrieved the matching text box, it can perform other tasks such as clearing the current value, tweaking a property, or even changing the text box color. Note that the FindControl() method returns a generic Control reference, because you might search any type of control. To access all the properties of your control, you need to cast it to the appropriate type (such as TextBox in this example).

In the App controller, you can also include any helpers that may be used in any or all controllers. This is done, as in an individual controller, by assigning a list of helpers in the array of the var $helpers attribute. For the sake of your blog application, let s go ahead and include all the helpers you will need to use. Insert the following line into line 3 of the new App controller: var $helpers = array('Html','Form','Ajax','Javascript'); The $javascript->link() function in the default layout file should now work properly. Generally, when using helpers in layouts, you should use the App controller to include those helpers; it will save you from having to do helper includes in every controller.

One of ASP.NET s most powerful validation controls is the RegularExpressionValidator, which validates text by determining whether or not it matches a specific pattern. For example, e-mail addresses, phone numbers, and file names are all examples of text that has specific constraints. A phone number must be a set number of digits, an e-mail address must include exactly one @ character (with text on either side), and a file name can t include certain special characters like \ and . One way to define patterns like these is with regular expressions. Regular expressions have appeared in countless other languages and gained popularity as an extremely powerful way to work with strings. In fact, Visual Studio even allows programmers to perform a search-and-replace operation in their code using a regular expression (which may represent a new height of computer geekdom). Regular expressions can almost be considered an entire language of their own. How to master all the ways you can use regular expressions including pattern matching, back references, and named groups could occupy an entire book (and several books are dedicated to just that subject). Fortunately, you can understand the basics of regular expressions without nearly that much work.

All regular expressions consist of two kinds of characters: literals and metacharacters. Literals are not unlike the string literals you type in code. They represent a specific defined character. For example, if you search for the string literal "l", you ll find the character l and nothing else.

Metacharacters provide the true secret to unlocking the full power of regular expressions You re probably already familiar with two metacharacters from the DOS world ( and *) Consider the command-line expression shown here: Del ** The expression ** contains one literal (the period) and two metacharacters (the asterisks) This translates as delete every file that starts with any number of characters and ends with an extension of any number of characters (or has no extension at all) Because all files in DOS implicitly have extensions, this has the well-documented effect of deleting everything in the current directory Another DOS metacharacter is the question mark, which means any single character For example, the following statement deletes any file named hello that has an extension of exactly one character Del hello The regular expression language provides many flexible metacharacters far more than the DOS command line.

Before you can use the Ajax helper to handle user comments, you will need to create the table to store the comments in the database. Make the new table with the name comments in the database, and create the fields shown in Listing 8-1. Listing 8-1. SQL for Creating the comments Table CREATE TABLE `comments` ( `id` int(11) unsigned NOT NULL auto_increment, `name` varchar(255) default NULL, `content` text, `post_id` int(11) unsigned, PRIMARY KEY (`id`) ); Next, create the Comment model with the code shown in Listing 8-2. Listing 8-2. The Comment Model < class Comment extends AppModel { var $name = 'Comment'; var $belongsTo = array('Post'); } >

In this first set of exercises, you will goal seek to find the number of child, adult, and senior tickets that you need to sell to achieve a specified box office income.