You can specify you property as boolean directly. There is no need for you to do some extra casts in your project.
Please see the attached sample project, where I have an example for a forward mapped boolean, which is translated to the db type number. Also you can find a reverse project, where I used a number(1) db type that is mapped to a boolean in my domain class. Please adjust the connection string in the app.config to work with the projects.
I hope this information is useful for you.
Feel free to ask if you have any other question.
the Telerik team
Follow @OpenAccessORM Twitter channel to be the first one to get the latest updates on new releases, tips and tricks and sneak peeks at our product labs!