问个很弱智的C#的问题在某个Visual Studio .Net的教材上看到了这样的Hello World的Code,但是在VC6里死活也不能compile.请问是为什么？难道只有VS.Net才可以？谢了 using System; class Welcome { static void Main() { Console.WriteLine("Please Enter Your Name:"); string name = Console.ReadLine(); Console.WriteLine("Welcome to you, {0}!", name); } } DEBUG: error C2873: 'System' : symbol cannot be used in a using-declaration fatal error C1004: unexpected end of file found