I need to use code similar to below on the _Row Inserting event to locate the control and later access it's value.
I think this is because I am not using the conventional edit form, but a edit form template containing a custom user defined web control making use of ASPx controls.
In the Row Updating event the New Values, Old Values, and All Keyscollections are empty.
From this Use Net thread apparently the collections are only available when using the datasource controls or the objectdatasource.
The appropriate solution is storing the Data Source in the Session. Load Post Data to the required controls explicitly via the Dev Express.