I really like this check when working with class libraries; I know that I can specify a default namespace for a library project if I need.
However, this constantly bothers me when I'm working with WebSite C# applications. It is not possible to specify a default namespace for this type of VS projects. And I don't think that it's a god idea to use namespaces like App_Code.MySubFolder instead of MyCompany.MyApplication.MySubFolder for classes located inside App_Code/MySubFolder. Any ideas?