public InternetConnection(IContainer container)
{
container.Add(this);
InitializeComponent();
bgworker = new BackgroundWorker();
bgworker.WorkerReportsProgress = false;
bgworker.WorkerSupportsCancellation = false;
bgworker.DoWork += new DoWorkEventHandler(this.BackgroundWorker_DoWork);
bgworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(this.BackgroundWorker_RunWorkerCompleted);
}
{
container.Add(this);
InitializeComponent();
bgworker = new BackgroundWorker();
bgworker.WorkerReportsProgress = false;
bgworker.WorkerSupportsCancellation = false;
bgworker.DoWork += new DoWorkEventHandler(this.BackgroundWorker_DoWork);
bgworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(this.BackgroundWorker_RunWorkerCompleted);
}
组件创建完，全部编译下整个解决方案，打开最初创建的项目WindowsFormsApplication1的窗体Form1，我们会在VS IDE中的工具箱中发现我们刚刚创建的名为InternetConnection组件，将其拖到Form1窗体上，便有了其类型的实例internetConnection1。在窗体上我们放置一个Button、一个WebBrowser和一个StatusStrip，并且在StatusStrip中添加一个StatusLabel。我们利用WebBrowser显示一个特定网页，来表示Internet连接可用。
选中 internetConnection1 我们会发现其公开了两个事件，我们为这两事件添加相应处理代码：
private void internetConnection1_Connected(object sender, EventArgs e)
{
toolStripStatusLabel1.Image = Properties.Resources.Online;
toolStripStatusLabel1.Text = "已连接到 Internet，正在打开 it168.com 网页....";
webBrowser1.Navigate("http://www.it168.com/");
}
private void internetConnection1_ConnectFailure(object sender, EventArgs e)
{
toolStripStatusLabel1.Image = Properties.Resources.Offline;
toolStripStatusLabel1.Text = "未连接到 Internet";
webBrowser1.Navigate(Application.StartupPath + "\\Error.html");
}
{
toolStripStatusLabel1.Image = Properties.Resources.Online;
toolStripStatusLabel1.Text = "已连接到 Internet，正在打开 it168.com 网页....";
webBrowser1.Navigate("http://www.it168.com/");
}
private void internetConnection1_ConnectFailure(object sender, EventArgs e)
{
toolStripStatusLabel1.Image = Properties.Resources.Offline;
toolStripStatusLabel1.Text = "未连接到 Internet";
webBrowser1.Navigate(Application.StartupPath + "\\Error.html");
}
