Clarification about three tier architecture in ASP.NET with C# code

Hi....

Can anyone post a good example for 3 tier or 4 tier architecture regarding generic data access layer (DAL) and business layer (BL) and a simple form in asp.net with c# code.

I will be glad if DAL contains main functions like insert , update , delete , select using stored procedures and command text, also how to fill dataset.

anyone can send the project to my mail id also [email protected]

I am using ASP.NET with C# in our new project. Connection string is written in web.config file. Back end is SQL Server 2005

Thanks and Regards

Sankar