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The RadioButton control exposes a GroupName property. All the RadioButton controls on a form with the same value for this property comprise a group of options that are mutually exclusive. You must assign a nonempty string to this property even if there s only one group of radio buttons on the form; otherwise each control will be consid ered a group by itself and won t work as expected. The Table, TableRow, and TableCell controls work exactly like their HTML Server control counterparts, including the ability to add new rows and columns using the Rows and Columns collection. You can, however, assign the contents of a table cell using the Text property (instead of the InnerText or InnerHtml properties for HTML controls). Another important difference is how the Visual Studio designer deals with the Table control: using the dialog boxes shown in Figure 24-12 and without writing any code at all, you can add rows and cells at design time by clicking on the Rows item in the Properties window.

Figure 24-12

The Web Forms portion of the framework supports six validation controls whose pur pose is to perform the most common types of validation on other controls on the form, typically TextBox controls:

Xbox Live uses the TCP/IP protocol to connect Xbox consoles and Windows PCs for networked game play. All Xbox games provide support for some form of network connection using Xbox Live. This can be as simple as the uploading of high scores and achievements to your gamertag. However, many games provide very advanced network play facilities, with Xbox Live connectivity allowing gamers to set up and play multi-player sessions.

The RequiredFieldValidator control checks that a given input control isn t empty. The RangeValidator control checks that the value of an input control is within a specified range of valid values.

) Tip If none of the color schemes is exactly what you are looking for, you can create your own by selecting a starting color scheme (preferably one that is close to what you want), clicking Create New Color Scheme at the bottom of the Color Schemes pane, and then choosing colors in the Create New Color Scheme dialog box After you save the scheme with a name of your choosing, it appears at the top of the Color Schemes list both in the Format Publication task pane and in the Getting Started window, and you can apply it to any publication in the usual way..

Part VI:

The CompareValidator control checks that the value of an input control is equal to, lower than, or higher than another value, which can be a constant or the contents of another control. The RegularExpressionValidator control checks that the value in an input control matches a given regular expression. The CustomValidator control defines a client-side or server-side function (or both) that validates the contents of an input control. The ValidationSummary control gathers the error messages from all the validation con trols on the same form and displays them in a region of the form or in a message box.

An important note: all the validation controls except RequiredFieldValidator check the value of the companion input field only if it isn t empty; if the field is empty, the vali dation succeeds. For this reason, you must use an additional RequiredFieldValidator control if you want to check that the input field contains a nonempty value. The great thing about a validation control is that the validation is performed both inside the client browser (if the browser supports scripts and script support hasn t been disabled) and on the server with the page s ClientTarget property or the validation con trol s EnableClientScript property. The server-side validation is performed in all cases because a malicious user might save the HTML, filter out all client-side scripts, and post the page to the server. (This is a type of spoofing attack.) The first five validation controls can send their error message to the ValidationSummary control on the same page or can display their own message. In the latter case, you should place the validation control near the input control it validates.

If you have used Xbox Live, you know about gamertags. A gamertag is a name by which a player is known on the Xbox Live network. You have created an account on the Xbox Live network associated with a unique gamertag that other gamers can use to find you. Your gamertag is also linked to your game achievement records and other game-related information that is stored for you by the Xbox Live system. You can also create an avatar which lets other gamers see what you look like.

All the validation controls except ValidationSummary derive from the BaseValidator base class, from which they inherit the properties and methods they have in common: