>An unhandled exception of type 'System.Exception' occurred in Mere Mortals Framework 2005.dll
>
>Additional information: A database key must be specified
>
>
>when I tested business object ,,retrieving data..
> method getorderbyorderid()

In your project's ABusinessObject class, you need to set the DatabaseKey property to match the key that is in your app.config file. For example:

this.DatabaseKey = "Northwind";

Best Regards,