c# - Should 'using' be inside the namespace or outside?

Possible
Duplicate:
href="https://stackoverflow.com/questions/125319/should-usings-be-inside-or-outside-the-namespace">Should
Usings be inside or outside the namespace

Are
there any technical reasons for preferring this

namespace
            Foo
{

 using System;
 using
            System.IO;

instead of
the default

using
            System;
using System.IO;

namespace
            Foo

{

Answer

Eric Lippert href="http://blogs.msdn.com/b/ericlippert/archive/2007/06/25/inside-or-outside.aspx">explains
this.

In general, they're
identical.
However, using statements in the
namespace can see namespaces and aliases included outside the
namespace.