Hello Chau Cheng,
1. You can set the type mapping from the Backend configuration settings wizard. Navigate to Telerik -> OpenAccess -> Configuration->Backend configuration settings. At the bottom of the pop up window you will see a CLR Type Mapping setting. Click on the Collection and open the mapping screen. Set NVARCHAR for the SQL type of the System.String CLR type. Clicking ok will result in adding the following node to your app.config file:
2. Unfortunately this is not yet possible with Telerik OpenAccess ORM. The only workaround would be to manually rename your column names. We are terribly sorry for any inconvenience this might have caused.
All the best,
Petar
the Telerik team