Assembly: System.Web (in System.Web.dll)
This event is only raised 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.
The control must have viewstate enabled for the ServerChange event to work correctly.
This event is commonly used to perform data validation on the HtmlTextArea control when the user updates the text in the control.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The 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 in a derived class, be sure to call the base class's method so that registered delegates receive the event.
The following code example demonstrates how to specify and create a custom event handler for the ServerChange event. A message is displayed when the value entered in the HtmlTextArea control exceeds 20 characters.