I have a project creating a website in asp.net and there i am creating three project for different access layers like data access ,business access but when I am using that namespace in my project getting error at build time type or namespace not found however I add refrence in my website ..please let me know where I am wrong..or what I have to do next..

have you added a reference to those other projects?

I just added reference to my website not to other project where I have to give reference in project means if I have DAl project for data access a Bal project for business layer & a buiness object layer containing table fields in class so what would be the reference cycle..