.NET webbrowser - documentcompleted not responding correctly

Question

i am doing this:

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    if (webBrowser1.DocumentText.IndexOf("Negative Orders") != -1)
    {
        webBrowser1.Navigate(@"http://............somepage");

        while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
        {
            Application.DoEvents();
        }

        MessageBox.Show("finished loading");
    }
}

something very weird is happening. it is succesfully entering the IF STATEMENT ; however once it executes the webBrowser.Navigate , it enter the while , and after the while it simply returns. it does not do the messagebox at all.

what is going on here?

Answer 1

It sounds like an exception is occurring. Try putting the whole thing in a try catch and breaking when an exception occurs

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    try
    {
        if (webBrowser1.DocumentText.IndexOf("Negative Orders") != -1)
        {
            webBrowser1.Navigate(@"http://............somepage");

            while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }

            MessageBox.Show("finished loading");
        }
    }
    catch (Exception x)
    {
        System.Diagnostics.Debugger.Break();
    }
}

Answer 2

I believe your message box is not being called because your code is still in the Application.DoEvents(); section deep down your call stack. It is probably waiting for you to leave the webBrowser1_DocumentCompleted method to invoke the next DocumentCompleted handler and finally set the ReadyState to Complete .

I don't recommend using Application.DoEvents(); at all, but specially not inside webBrowser1_DocumentCompleted .