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    <p>I have yet to find a working solution to this problem online. Hopefully this will make it to the top and save everyone the months of tweaking I spent trying to solve it, and the edge cases associated with it. I have fought over this issue over the years as Microsoft has changed the implementation/reliability of isBusy and document.readystate. With IE8, I had to resort to the following solution. It's similar to the question/answer from Margus with a few exceptions. My code will handle nested frames, javascript/ajax requests and meta-redirects. I have simplified the code for clarity sake, but I also use a timeout function (not included) to reset the webpage after if 5 minutes domAccess still equals false.</p> <pre><code>private void m_WebBrowser_BeforeNavigate(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel) { //Javascript Events Trigger a Before Navigate Twice, but the first event //will contain javascript: in the URL so we can ignore it. if (!URL.ToString().ToUpper().StartsWith("JAVASCRIPT:")) { //indicate the dom is not available this.domAccess = false; this.activeRequests.Add(URL); } } private void m_WebBrowser_DocumentComplete(object pDisp, ref object URL) { this.activeRequests.RemoveAt(0); //if pDisp Matches the main activex instance then we are done. if (pDisp.Equals((SHDocVw.WebBrowser)m_WebBrowser.ActiveXInstance)) { //Top Window has finished rendering //Since it will always render last, clear the active requests. //This solves Meta Redirects causing out of sync request counts this.activeRequests.Clear(); } else if (m_WebBrowser.Document != null) { //Some iframe completed dom render } //Record the final complete URL for reference if (this.activeRequests.Count == 0) { //Finished downloading page - dom access ready this.domAccess = true; } } </code></pre>
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    1. POHow to use WebBrowser control DocumentCompleted event in C#?
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    1. USMarcus Pope
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    1. COcould you perhaps elaborate on the differences to previous IE versions?
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      1. USpeterchen
    2. COIn my early years of webbrowser automation I was able to simply use the documentcomplete function - this was around 2002/3 - ie5.5/6. If your pdisp object matched the top document window then the document was completely ready and it always fired. These days ~when~ it does fire you can be assured your document is ready, but how do you know when an event doesn't happen in an async event model without a large inefficient timeout? IsBusy used to be a good indicator for changing the mouse cursor, but I've seen IsBusy stay true indefinitely in recent version of 7 & 8.
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    3. COAnd if I recall correctly AJAX requests did not trigger these event properly until IE6, and since ie7 or ie8 they now trigger duplicate before navigate events. And don't even bother with navigate complete or download complete events as they won't help you in determining the completion status of a navigation lifecycle.
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