Why put using statements inside the namespace in C#? [duplicate]

Question

I've noticed some C# code has the using statements within the namespace instead of at the top of the file. For example, instead of this:

using System; namespace SomeClassNameSpace { public class SomeClass { } }

They have this:

namespace SomeClassNameSpace { using System; public class SomeClass { } }

Is this a matter of personal preference or is there a reason for having using statements inside or outside the namespace tag?

It is a StyleCop rule, SA1200: UsingDirectivesMustBePlacedWithinNamespace — Hans Passant
– Hans Passant, Commented May 24, 2014 at 2:26

Dreadnought · Accepted Answer · 2014-05-24 02:19:33Z

Well if you define classes or methods outside of that namespace within the same file then using System will be global for the whole file rather than just for the namespace.

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