Public Shared Function FromCopy( _
   ByVal srcFileName As String _
) As TempFile

public static TempFile FromCopy( 
   string srcFileName
)

using(TempFile a = TempFile.FromExtension(".test"))
{
    a.WriteAllText("a");
    Assert.AreEqual("a", a.ReadAllText());
    Assert.AreEqual(".test", Path.GetExtension(a.TempPath));

    using (TempFile b = TempFile.FromCopy(a.TempPath))
    {
        Assert.AreEqual("a", b.ReadAllText());
        Assert.AreEqual(".test", Path.GetExtension(b.TempPath));
    }
}

Using a As TempFile = TempFile.FromExtension(".test")
    a.WriteAllText("a")
    Assert.AreEqual("a", a.ReadAllText())
    Assert.AreEqual(".test", Path.GetExtension(a.TempPath))

    Using b As TempFile = TempFile.FromCopy(a.TempPath)
        Assert.AreEqual("a", b.ReadAllText())
        Assert.AreEqual(".test", Path.GetExtension(b.TempPath))
    End Using
End Using