InternetExplorer ie = null;

        public InternetExplorer LaunchIE()
        {
            Process p = Process.Start("iexplore.exe", "about:blank");
            //SetForegroundWindow(p.MainWindowHandle);

            if (p == null)
            {
                throw new Exception("Could not launch IE");
            }

            ShellWindows allBrowser = new ShellWindows();

            if (allBrowser.Count == 0)
            {
                throw new Exception("Can not find IE");
            }

            Int32 i = 0;
            while (i < allBrowser.Count && ie == null)
            {
                InternetExplorer e = (InternetExplorer)allBrowser.Item(i);

                if (e.HWND == (int)p.MainWindowHandle)
                {
                    ie = e;
                }

                i++;
            }

            return ie;
        }

各位高人,小D以上的代码,这里if (e.HWND == (int)p.MainWindowHandle)
抛出这个异常:

Specified cast is not valid.

 照书抄的..不知道为什么会出这个异常.

希望各位高人能抽空帮忙回答下,拜谢!

平台:Windows Vista 6001, VS 2008, .NET Framework 3.5