Registers a control as a trigger for a postback. This method is used to configure postback controls inside an UpdatePanel control that would otherwise perform asynchronous postbacks.
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
Use the method to register postback controls inside an UpdatePanel control as triggers. Controls that are registered by using this method update a whole page instead of updating only the UpdatePanel control's content. Registering a postback control with this method outside an UpdatePanel control has no affect because by default these controls do not perform asynchronous postbacks.
You can add the trigger declaratively by using the Triggers element of the UpdatePanel control. In Visual Studio 2010, use the designer's UpdatePanelTrigger Collection Editor dialog box.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.