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(@"SoftwareMicrosoftWindowsCurrentVersionUninstall", 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

}
}