Notifies the ASP.NET application that the state of the System.Web.UI.WebControls.HiddenField control has changed.
The HiddenField.RaisePostDataChangedEvent method is a helper method used by the System.Web.UI.WebControls.HiddenField class to notify the ASP.NET application that the state of the System.Web.UI.WebControls.HiddenField control has changed.