c# - "using" statement locations within namespace declarations

I'm supporting some code that, unusually, has all its using statements contained within the namespace declaration. It makes me a bit uncomfortable but I have no idea if this should be anything to be concerned about or not. I can't think of an immediate problem other than it being counter to usual convention.

Is there anything wrong with:

namespace myProject.controls
{
    using System;
    using System.Collections;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;

Instead of the more widely-used:

using System;
using System.Collections;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;


namespace myProject.controls
{