usingブロックの中でクロージャー

ClosureTest.cs

using System;
using System.Windows.Forms;
using NUnit.Framework;

class ClosureTest
{
    [Test]
    public void ClosureWithinUsingTest()
    {
        Func<bool> closure;
        using (var obj = new Control())
        {
            closure = () => obj.IsDisposed;
        }
        Assert.IsFalse(closure()); // Fail
    }
}