Easily select default usings for project namespaces and subamespaces

Is there an easy way in Visual Studio to assign default usings when i make a new file in a certain (sub)namespace in my 开发者_JS百科project?

You can create a new template with File -> Export Template... -> Item Template, but to be honest I never bother - there is a "Remove Unused Usings" option for cleaning down, and Ctrl+. for adding them...

Modify the template file in zip files under "c:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\CSharp\Code\1033\"