using namespace

问题

what is the difference between

using System;     

and

using namespace System;    

is it the same thing?

thanks

回答1:

Yes, there's a difference. The first one doesn't compile. Maybe you meant this:

#using <System.dll>
using namespace System;

The #using directive allows you to reference an assembly without going through the Framework and References project setting.

来源：https://stackoverflow.com/questions/4906540/using-namespace