是否联网以及热点问题

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.NetworkInformation;
using System.Runtime.InteropServices;
using Microsoft.Win32;namespace DCWriterTasks
{
    public partial class Form1 : Form
    {
        #region Initionalization
        public Form1()
        {
            InitializeComponent();
        }
        #endregion        #region Methods
        //使用System.Net.NetworkInformation下的Ping以及PingReply判断网络
        /// <summary>
        /// 判断是否有网络
        /// </summary>
        /// <returns></returns>
        public bool OnlineOrNot()
        {
            bool resultoOnlineOrNot = false;
            Ping ping = new Ping();
            PingReply pingReply;
            //向百度ping看看，能否ping通，通了有网络，否则无网络
            //pingReply = ping.Send("202.108.22.5");
            pingReply = ping.Send("www.baidu.com");
            //pingReply = ping.Send("http://www.dcwriter.cn/html/Template/DCWriter.html");
            if (pingReply.Status == IPStatus.Success)
            {
                resultoOnlineOrNot = true;
                return resultoOnlineOrNot;
            }
            return resultoOnlineOrNot;        }
        //使用System.Runtime.InteropServices调用wininet中的 InternetGetConnectedState API判断网络
        //判断internet的网络连接状态
        [DllImport("wininet", EntryPoint = "InternetGetConnectedState")]
        private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);        /// <summary>
        /// 判断是否有网络
        /// </summary>
        /// <returns></returns>
        public bool OnlineOrNot1()
        {            bool resultoOnlineOrNot = false;
            int i = 0;
            if (InternetGetConnectedState(out i, 0))
            {
                resultoOnlineOrNot = true;
                return resultoOnlineOrNot;
            }
            return resultoOnlineOrNot;
        }  

        /// <summary>
        /// 访问Access 数据库
        /// </summary>
        /// <param name="access"></param>
        /// <returns></returns>
        public bool AccessExistOrNot(string access)
        {
            using (RegistryKey key = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Uninstall", false))
            {
                if (key != null)//判断对象存在
                {
                    foreach (string keyName in key.GetSubKeyNames())//遍历子项名称的字符串数组
                    {
                        using (RegistryKey key2 = key.OpenSubKey(keyName, false))//遍历子项节点
                        {
                            if (key2 != null)
                            {
                                string softwareName = key2.GetValue("DisplayName", "").ToString();//获取软件名
                                if (softwareName.IndexOf(access) > -1)
                                {
                                    //string installLocation = key2.GetValue("InstallLocation", "").ToString();//获取安装路径
                                    return true;
                                }
                            }
                        }
                    }
                }
            }
            return false;
        }        #endregion
        #region Events
        /// <summary>
        /// 打开模板浏览器
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbModeBroser_Click(object sender, EventArgs e)
        {
            bool onlineOrNot = false;
            onlineOrNot = OnlineOrNot1();
            if (onlineOrNot)
            {
                myWebBrowser.Navigate("http://www.dcwriter.cn/html/Template/DCWriter.html");
            }
            else
            {
                myWebBrowser.Navigate("about:blank");
            }
        }        /// <summary>
        /// 打开地图热点
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbMapHot_Click(object sender, EventArgs e)
        {
            bool onlineOrNot = false;
            onlineOrNot = OnlineOrNot1();
            if (onlineOrNot)
            {
                myWebBrowser.Navigate("http://www.dcwriter.cn/CustomerCase/DCWriterCustomerCase.HTML");
            }
            else
            {
                if (MessageBox.Show("对不起无网络！是否使用本地文件？", "友情提示：", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.Yes)
                {
                    myWebBrowser.Navigate(System.IO.Path.Combine(Application.StartupPath, "本地地图.png"));
                }
                else
                {
                    myWebBrowser.Navigate("about:blank");
                }
            }
        }        private void tsbAccessClient_Click(object sender, EventArgs e)
        {
            //System.Net.WebClient myWebClient = new System.Net.WebClient();
            ////Uri uri = new Uri("ftp://ygdy8:ygdy8@y219.dydytt.net:9066/[阳光电影www.ygdy8.com].叶问3.BD.720p.国粤双语中字.mkv");
            //Uri uri = new Uri("http://192.168.0.100:8080");
            //myWebClient.DownloadFileAsync(uri, System.IO.Path.Combine(Application.StartupPath, "哈哈"));
            bool accessExistOrNot = AccessExistOrNot("Access");
            if (accessExistOrNot)
            {
                //访问Access 数据库
                //if (MessageBox.Show("Access 数据库不存在，是否访问本地文件？", "信息提示：", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.Yes)
                //{                    
                //}
            }
            else 
            {
                //访问本地文件
            }
        }
        #endregion    }
}

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