Default using directives in new C# files
问题 Why does Visual Studio 2008 automatically insert the following using directives into each new C# file I create? using System; using System.Collections.Generic; using System.Text; What's so special about these namespaces? Are these the most frequently used ones? 回答1: Yes, they're frequently used, that's all, so MS put them in the Visual Studio templates. Personally I use "sort and remove unused usings" pretty frequently, so they often go away. If you want to remove them, you can amend the "new