Are ADT's compatible with the current release of Visual Studio .NET?

A couple years ago I had done some C# programming with .NET 2003 and a SS2000 db that used UDT's but .NET did not recognize the UDT's. That actually made programming harder, since you had to go look up the definition for the UDT and use a native .NET data type.

Does Visual Studio .NET 2005 allow you to use ADT's, and how is that done?