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HtmlTextArea.OnServerChange Method

Raises the ServerChange event of the HtmlTextArea control. This allows you to provide a custom handler for the event.

Namespace:  System.Web.UI.HtmlControls
Assembly:  System.Web (in System.Web.dll)

abstract OnServerChange : 
        e:EventArgs -> unit  
override OnServerChange : 
        e:EventArgs -> unit


Type: System.EventArgs

A System.EventArgs that contains the event data.

The ServerChange event is raised when the content of the HtmlTextArea control changes between posts to the server.


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 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 OnServerChange 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 create a custom event handler for the ServerChange event. A message is displayed when the value entered in the HtmlTextArea control exceeds 20 characters.

No code example is currently available or this language may not be supported.
No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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