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Page or Control AutoEventWireup CodeFile Inherits Language Import Register OutputCache Assembly Implements Reference
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Wires page events that follow the Page_ naming convention automatically if true (default). If false, event handlers need to be wired explicitly. Specifies the path to the code-behind file. Specifies the name of the class that goes together with the page. Specifies the language used for writing inline code in the page. Opens a namespace specified by the Namespace attribute and makes it available to all code in the page. Registers a user control for use with the page. See the section Creating Custom ASP.NET Server Controls later in this chapter. Declaratively controls caching; if present, ASP.NET keeps the rendered output of a page or a control in a cache for a specified amount of time. References an external assembly. You can use the Name attribute to specify the name of the assembly (without the extension). Specifies that the page implements the interface specified in the Interface attribute. Associates another page or user control with the current one. You can use the Control, Page, or VirtualPath attribute to identify the component to be referenced, causing it to be compiled together.
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CHAPTER 14 BUILDING SMART WEB APPLICATIONS
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In web forms, ordinary HTML markup such as <strong>, <ul>, and <h2> is treated as text and is passed to the browser verbatim (via the LiteralControl server control class). On the other hand, explicit server controls (those with the runat="server" attribute) are processed on the server and translated to HTML markup (just to illustrate, there are server controls that equate to hundreds of HTML tags, and many can be mapped nearly one to one). All server controls can be programmatically managed, which typically means you customize the way they respond to various events or how they appear or behave visually. Categorically speaking, there are two main types of server controls: HTML server controls that directly correspond to an HTML element and web server controls. The second type can be divided into several groups depending on the use of the control. For example, validation controls ensure that entered values fulfill some criteria, data source controls are similar to the ObjectDataSource mentioned earlier, membership controls handle user login and registration, and so on. In Listing 14-2, you saw server controls such as labels and buttons, both of which are web-server controls. It s beyond the scope of this book to discuss the great number of web-server controls available in ASP.NET 2.0 and above. As a reference, Table 14-5 shows some of the ones most commonly used. Table 14-5. Common ASP.NET Server Controls
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Basic Data viewing/editing Data sources Membership Validation
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Button, TextBox, Label, Panel, CheckBox, ListBox, RadioButton, PlaceHolder, DropDownList Repeater, DataList, GridView, DetailsView ObjectDataSource, SqlDataSource Login, LoginView RequiredFieldValidator, CompareValidator, RegularExpressionValidator
HTML server controls correspond to a given HTML tag and are applied by adding the runat="server" attribute. This turns the standard HTML tag into a server control, allowing you to change its appearance or behavior programmatically. Because web-server controls offer a more robust object model, they re almost always preferable to HTML server controls. Validation controls are a special type of web controls that perform typical validation patterns on your web form input fields and display error messages where appropriate. The Validation section of the Visual Studio Toolbox contains the available validation controls, as summarized in Table 14-6. Table 14-6. Common ASP.NET Validation Controls
Control Name
RequiredFieldValidator RangeValidator RegularExpressionValidator
Description
Ensures that the associated input control isn t empty. Validates that the user input is in a given range. Checks whether the user input matches a regular expression pattern. See 10 for a description of using .NET regular expressions.
CHAPTER 14 BUILDING SMART WEB APPLICATIONS
Control Name
CompareValidator CustomValidator ValidationSummary
Description
Compares the user input against a given value or another control. Validates the user input based on custom, user-specified logic. Lists all validation error messages.
Each validator has an ErrorMessage and a Text property that you can set in conjunction with displaying an error message. When the validator fails, it displays the content of the Text property at the place where it s inserted in your page markup. A typical scenario ensures that a given user-input control has a value entered. Here, all you need to do is add your input control and a RequiredFieldValidator next to it, set its ControlToValidate property to the ID of the associated input control, and set the Text property to *. This shows an asterisk when no value is entered in the input control at the time the page is submitted. Using another validator is just as easy, except you need to customize different properties. Table 14-7 summarizes the main properties for each validator. Table 14-7. The Main Customizable Validator Properties
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