The ItemDeleted/ItemUpdated events will be raised when you have assigned data source control for the grid (setting its DataSourceID) and allowed automatic operations for the control.
Since this does not seem to be your case, I suggest you set the AllowAutomatic[Action] properties of the grid to false and implement the update/delete operations manually intercepting the DeleteCommand/UpdateCommand events of the control.
Additionally, consider using advanced binding through the NeedDataSource event
and remove the code which uses simple binding with DataBind() from your PageLoad handler.
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