View. On Page Pre Load(Object, EventArgs) Method
Sets the initialized state of the data-bound control before the control is loaded.
protected: override void OnPagePreLoad(System::Object ^ sender, EventArgs ^ e);
protected override void OnPagePreLoad (object sender, EventArgs e);
override this.OnPagePreLoad : obj * EventArgs -> unit
Protected Overrides Sub OnPagePreLoad (sender As Object, e As EventArgs)
The OnPagePreLoad method is used to control when data binding occurs within the life cycle of the page. It does this by setting the internal initialized state of the data-bound control. Because the control's initialized state is set during the PreLoad phase of the page's life cycle, the OnDataPropertyChanged event handler is called any time a data property of the control is changed after that phase, to signal that the control must re-bind to its data before rendering.
The OnPagePreLoad method is overridden by the DetailsView class to set the RequiresDataBinding property to
true in cases where the HTTP request is a postback and view state is enabled but the data-bound control has not yet been bound. This scenario is common with controls such as Wizard and MultiView, where the visibility of the control is changed at run time.