I upload a new version of your solution ‘testgriddetails’.
I set ‘CanUserAddRows = "False"‘ within the Customer Datagrid.
DateTime fields are mostly something special e.g. there is no Null-Value (it is not = 0). Potentially a solution can be a ‘DatePicker’.
I also add a ‘CheckBox’ to the CustomerGrid with some processing to show the state.
Freundliche Grüsse
Werner Lanter
EDV-Organisation
CH-8964 Rudolfstetten