使用Linq表达式树设计灵活高级搜索的模式或技术

I'm looking to add an "advanced search" capability to my ASP.NET/SQL Server 2005 application. Ideally, I'd like it to be table driven. For example, if my schema changes with the addition of a new column to a table that I want to search, I'd like to have the UI reflect the addition of the new column as a searchable field. I can envision some control tables that contain the searchable fields, their types, associated lookups, etc.I'm looking to add an "advanced search" capabil