DataList::OnUpdateCommand Method
Raises the UpdateCommand event. This allows you to provide a custom handler for the event.
Assembly: System.Web (in System.Web.dll)
Parameters
- e
- Type: System.Web.UI.WebControls::DataListCommandEventArgs
A DataListItemEventArgs that contains event data.
Use the OnUpdateCommand method to provide a custom handler for the UpdateCommand event.
The UpdateCommand event is raised when the Update button for an item is clicked.
A typical handler for the UpdateCommand event updates the data, sets the EditItemIndex property to -1 (to deselect the item), and then rebinds the data to the DataList control.
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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. |
Raising an event invokes the event handler through a delegate. For more information, see How to: Consume Events in a Web Forms Application.
The OnUpdateCommand method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors:When overriding OnUpdateCommand in a derived class, be sure to call the base class's OnUpdateCommand method so that registered delegates receive the event.
The following code example demonstrates how to specify and code a handler for the UpdateCommand event. It allows you to update the selected item in the DataList control with the new values entered by the user when the Update button is clicked.
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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.
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