[DotNetDevelopment] Database accessing

[Sreenivas]

Hi,
     I have 3 classes namely ,
1)Task
2)Customer
3)Project

and their DB classes are
1)DbTask
2)DbCustomer
3)DbProject
respectively.Is it a good idea to interact Business logic classes
(Task ,Customer,Project) with Db
classes??
I heard creating DAO for .net is old fashioned one ,
(http://social.msdn.microsoft.com/forums/en-US/adodotnetdataproviders/
thread/7d30fbe3-b06d-48b9-a2c1-125acd608445/)
is it true?
Thanks in advance..