In addition to that, more #using directives are required to import more libraries to use more namespaces in the Base Class Library, such as #using <System.Windows.Forms.dll> and using namespace System::Windows::Forms; to use Windows Forms.
此外 #using directives 必須用 namespace 的方法來 import 更多的函式庫（libraries），像是 Base Class Library，例如： #using <System.Windows.Forms.dll> 以及 using namespace System::Windows::Forms; 来使用 Windows Forms。