webBrowser DropFileEvent Overload

public class WebBrowserEx : WebBrowser
    {
        private const int WM_DROPFILES = 0x233;

        [DllImport("shell32.dll")]
        private static extern uint DragQueryFile(
            IntPtr hDrop,
            uint iFile,
            StringBuilder lpszFile,
            uint cch);

        [DllImport("shell32.dll")]
        private static extern void DragAcceptFiles(IntPtr hWnd, bool fAccept);

        public WebBrowserEx()
            : base()
        {
            base.AllowWebBrowserDrop = false;
        }

        public event DragFileEventHandler DragFile;

        protected override void OnHandleCreated(EventArgs e)
        {
            base.OnHandleCreated(e);
            if (!DesignMode)
            {
                DragAcceptFiles(Handle, true);
            }
        }

        protected override void WndProc(ref Message m)
        {
            StringBuilder sb = new StringBuilder(1024);
            if (m.Msg == WM_DROPFILES)
            {
                uint count = DragQueryFile(m.WParam, 0xffffffff, null, 0);
                string[] files = new string[count];
                for (uint i = 0; i < count; i++)
                {
                    DragQueryFile(m.WParam, i, sb, 1024);
                    files[i] = sb.ToString();
                }
                OnDragFile(new DragFileEventArgs(files));
                return;
            }

            base.WndProc(ref m);
        }

        protected virtual void OnDragFile(DragFileEventArgs e)
        {
            if (DragFile != null)
            {
                DragFile(this, e);
            }
        }
    }

    public delegate void DragFileEventHandler(
        object sender,
        DragFileEventArgs e);

    public class DragFileEventArgs : EventArgs
    {
        private string[] _files;

        public DragFileEventArgs(string[] files)
        {
            _files = files;
        }

        public string[] Files
        {
            get { return _files; }
        }
    }