HtmlSelect::OnServerChange Method (EventArgs^)
Raises the ServerChange event of the HtmlSelect control. This allows you to provide a custom handler for the event.
Assembly: System.Web (in System.Web.dll)
Parameters
- e
-
Type:
System::EventArgs^
A System::EventArgs that contains the event data.
The ServerChange event is raised when the selected items in the HtmlSelect control change between posts to the server.
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This event is raised only when the user initiates a post to the server, such as by clicking a Submit button. This event does not cause a post to the server to occur. |
Note |
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The control must have view state enabled for the ServerChange event to work correctly. |
You can use this event to perform data validation on the HtmlSelect control when the user changes the selection in the control.
Raising an event invokes the event handler through a delegate. For more information, see NIB: Raising an Event.
The OnServerChange 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 the OnServerChange method in a derived class, be sure to call the base class's OnServerChange method so that registered delegates receive the event.
The following code example demonstrates how to specify and code an event handler for the ServerChange event of the HtmlSelect control. The event handler determines whether the selected items are compatible with each other.
Available since 1.1
