HierarchicalDataBoundControl.OnPagePreLoad Method
.NET Framework 3.0
Sets the initialized state of the data-bound control before the control is loaded.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
The OnPagePreLoad sets 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.