Asp.net page lifecycle explain in msdn

Http://msdn2.microsoft.com/en-us/library/ms178472.aspx

Here is the link about Asp.net page life-cycle and the following words need to pay attention

Catch-up events for added controls

For example, suppose you haveGridviewThat displays a company record in each row along with a list of the company officers inListBoxControl. To fill the list of officers, you wocould bindListBoxControl to a data source control (suchSqldatasource) That retrieves the company officer data using the companyid in a query.

If the ListBox Control's data-binding properties, such as datasourceid and datamember , are set Declaratively, the ListBox control will try to bind to its data source during the containing row's databinding event. however, the companyid field of the row does not contain a value until the gridview Control's rowdatabound event occurs. in this case, the child control (the ListBox Control) is bound before the containing control (the gridview Control) is bound, so their data-binding stages are out of sync.

To avoid this condition, put the data source control forListBoxControl in the same template item asListBoxControl itself, and do not set the data binding properties ofListBoxDeclaratively. Instead, set them programmatically at run time duringRowdataboundEvent, so thatListBoxControl does not bind to its data until the companyid information is available.