c# wince5.0 手持机开发中怎么wifi连接成功后怎么在程序中判断网络连接是否成功，并且和指定网站页面数据交换，多谢

c# wince5.0 手持机开发中如何wifi连接成功后如何在程序中判断网络连接是否成功，并且和指定网站页面数据交换，谢谢。

public static bool IsWebAccessible()

        {

            HttpWebRequest hwrRequest;

            HttpWebResponse hwrResponse;


            string strUrl = @"http://www.baidu.com/";

            bool bConnected = false;

            try

            {

                hwrRequest = (HttpWebRequest)WebRequest.Create(strUrl);

                hwrRequest.Timeout = 100;

                hwrResponse = (HttpWebResponse)hwrRequest.GetResponse();


                if (hwrResponse.StatusCode == HttpStatusCode.OK)

                {

                    bConnected = true;

                }

            }

            catch (WebException we)

            {

                bConnected = false;

            }

            catch (Exception ex)

            {

                bConnected = false;

            }

            finally

            {

                hwrRequest = null;

                hwrResponse = null;

            }

            return bConnected;

        }


       private void button1_Click_1(object sender, EventArgs e)

        {

            if (IsWebAccessible())

            {

                MessageBox.Show("可用");

            }

            else {

                MessageBox.Show("不可用");