ASP.NET中的业务/域对象

Just trying to gather thoughts on what works/doesn't work for manipulating Business/Domain objects through an ASP.NET (2.0+) UI/Presentation layer. Specifically in classic ASP.NET LOB application situations where the ASP.NET code talks directly to the business layer. I come across this type of design quite often and wondering what is the ideal solution (i.e. implementing a specific pattern) and what is the best pragmatic solution that won't require a complete rewrite where no "pattern" is implemented.Just trying to gather thoughts on what works/do