Question

I am using

System.Windows.Forms.WebBrowser

control in C# for displaying some pages. I want to do some custom work when the user clicks on a url of a page which does not exist.

Basically I want to set some values when the browser displays the following message

The page cannot be displayed 
 The page you are looking for is currently unavailable. The Web site might be experiencing technical difficulties 

How can I get the status so that I can differenciate between a page loaded and error page?

Answer 1

If you cast WebBrowser to the underlying ActiveX implementation, you can access the NavigateError event.

Note: You’ll need to add a reference to SHDocVw. Confusingly, this is in the COM tab with the name “Microsoft Internet Controls” with a path of c:\windows\system32\ieframe.dll

 private void button1_Click(object sender, EventArgs e)
        {
            //Note: you need to wait until the ActiveXInstance property is initialised.
            var axWebBrowser = (SHDocVw.WebBrowser)webBrowser1.ActiveXInstance;
            axWebBrowser.NavigateError += axWebBrowser_NavigateError; 
            webBrowser1.Url = new Uri("http://www.thisisnotavaliddomain.com");
        }

        void axWebBrowser_NavigateError(object pDisp, ref object URL, ref object Frame, ref object StatusCode, ref bool Cancel)
        {
            //handle your error
        }