Lock a WebBrowser object until DocumentComplete

Question

Hello everyone.
I have a problem when I use the WebBrowser object for navigating to multiple urls, one after the other. I have a list of urls. And for each url I want to navigate to this url, when DocumentCompleted event occurs, parse the information, and then go on to the next url in my list.
However, I need to lock the WebBrowser object in my foreach loop until a DocumentComplete event takes place, and then move on so it does not interrupt the download before it's completed. How can I do this?
Sort of like this:
foreach (string url in myUrlList)
{
      if (!this.Browser.IsBusy)
      {
            this.Browser.Navigate(artNo);
            this.Browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(DocumentCompleted);
      }
}

..but this example doesn't work. Just to give an idea of my problem.
Thanks in advance for any suggestions!

Sam Hobbs · Answer

Why not use an AutoResetEvent? Call AutoResetEvent.Set in the DocumentComplete event and after every navigation wait for the event. Although you have only one thread the DocumentComplete event occurs in a different thread therefore you need a sychronization object such as AutoResetEvent to accomplish the synchronization. Note that you should provide a timeout for the wait so that the code can deal with problems occuring during navigation.

Joakim Astrom · Answer

Thanks Sam. I have tried using a Semaphore now which I guess does kind of what you suggest!? But it still hangs on the first call and never reaches the DocumentComplete event so I never get at chance to release it. Maybe you can help me with the actual code? I have tried initializing the Semaphore in different ways without success. Thanks for suggestions. I initialize a global Semaphore: Constructor: pool = new Semaphore (1 1); MethodForNavigatingAllUrls: try { foreach(string url in UrlList) { pool.WaitOne(); browser.Navigate(url); browser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler (DocumentCompleted); } } catch ( Exception e) { MessageBox .Show(e.Message + 
 + e.StackTrace); } MethodDocumentComplete: { ...yada yada pool.Release(); }