This will lead to problems like "Grid View does not show updated values", "Grid View looses values changed by user". In your Page_load, this is typically only inside a block where you check to make sure that Page_Load is not being called during a post-back call.
event is raised when a row's Update button is clicked, but before the Grid View control updates the row.
Old Values("Control_Seq Ref_CH") Dim newvalue As String = e.
If you have handled the Row Updating event, changes will commit immediately to your data source as you lose focus on the edited row.
For a row to obtain or lose focus, you must have the Activation behavior enabled.
If you go with the flow, you probably won't get stuck, but the moment you try to go against the grain you end up with a hand full of thorns.
Most of the data controls have events ending in ing and ed e.g. In most of the event handlers of the ing events it is easy to get the values from the event args.