Question

I have an .Net Froms application that displays web pages through a WebBrowser control.

Is there anyway that I can detect if the control shows a ‘Page not found‘ or ‘Cannot display webpage‘ error? There doesn’t seem to be any error event handlers.

Answer 1

The WebBrowser windows forms control is wrapper around Internet Explorer and it doesn’t expose all the functionality of the underlying ActiveX control and particularly the NavigateError event. Here’s a workaround:

First add reference to SHDocVw.dll to your project (COM tab of Add Reference window). Then you can do the following to capture errors:

private void button1_Click(object sender, EventArgs e) {     SHDocVw.WebBrowser instance = (SHDocVw.WebBrowser)webBrowser1.ActiveXInstance;     instance.NavigateError += new SHDocVw.DWebBrowserEvents2_NavigateErrorEventHandler(instance_NavigateError);     webBrowser1.Navigate('http://www.google.com/foo'); }  void instance_NavigateError(object pDisp, ref object URL, ref object Frame, ref object StatusCode, ref bool Cancel) {     // Do whatever you want with the error             }