filenames - C# .cs file name and class name need to be matched?

Question

In Java the file name must be the public class name defined in that java file. Does C# has similar requirement? can I have a A.cs file which only defines a public Class B inside? thanks,

Answer 1

No, there is no similar requirement.

Yes, you can do this.

It is considered bad practice, however.

Microsoft StyleCop will warn you if you do this, but everything will compile fine.