Creates a multi selection check box group that can be dynamically created by binding the control to a data source.
Assembly: System.Web (in System.Web.dll)
The control provides a multi selection check box group that can be dynamically generated with data binding. It contains an Items collection with members corresponding to individual items in the list. To determine which items are checked, iterate through the collection and test the Selected property of each item in the list.
You can specify the way the list is displayed by using the RepeatLayout and RepeatDirection properties. If RepeatLayout is set to RepeatLayout.Table (the default setting), the list is rendered within a table. If it is set to RepeatLayout.Flow, the list is rendered without any table structure. By default, RepeatDirection is set to RepeatDirection.Vertical. Setting this property to RepeatDirection.Horizontal renders the list horizontally.
The control provides convenient data binding capabilities. However, individual CheckBox controls provide greater control over layout.
This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard Controls, How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Validating User Input in ASP.NET Web Pages.
The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.
The following code example demonstrates how to create a control on a Web page.
The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.