webbrowser的增加 删除FileDownload事件,该如何解决

webbrowser的增加 删除FileDownload事件

C# code

webtest.FileDownload += new EventHandler(webtest_FileDownload); private void test2_Click(object sender, EventArgs e)        {            webtest.Navigate(new Uri("file:///D:/桌面/Untitled-1.html"));            webtest.FileDownload += new EventHandler(webtest_FileDownload);        }        void webtest_FileDownload(object sender, EventArgs e)        {            textBox1.AppendText("文件下载完毕111111111");        }        void webtest_FileDownload2(object sender, EventArgs e)        {            textBox1.AppendText("文件下载完毕22222222222");        }//问题 private void test2_Click(object sender, EventArgs e)        {            //我想在这里实现,从webtest.FileDownload 中把webtest_FileDownload事件删除,同时加上webtest_FileDownload2 ,怎么写呢?也就是下一次webtest.FileDownload 时只触发webtest_FileDownload2        }

[解决办法]
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(HandleDocumentCompletedEvent); 
webBrowser1.DocumentCompleted –= HandleDocumentCompletedEvent;

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