i want to make a console program to monitor a webpage's htmlsourcecode, because some of the page content are created by some javescript, so i have to use webbrowser control. like : View Generated Source (After AJAX/JavaScript) in C#

my code is below:

public class WebProcessor
{
    public string GeneratedSource;
    public string URL ;

    public DateTime beginTime;
    public DateTime endTime;

    public object GetGeneratedHTML(object url)
    {
        URL = url.ToString();
        try 
        {
            Thread[] t = new Thread[10];

            for (int i = 0; i < 10; i++) 
            {
                t[i] = new Thread(new ThreadStart(WebBrowserThread));
                t[i].SetApartmentState(ApartmentState.STA);
                t[i].Name = "Thread" + i.ToString();
                t[i].Start();
                //t[i].Join();          
            }

        } 
        catch (Exception ex) 
        {
            Console.WriteLine(ex.ToString());
        }

        return GeneratedSource;
    }

    private void WebBrowserThread()
    {
        WebBrowser wb = new WebBrowser();
        wb.ScriptErrorsSuppressed = true;

        wb.DocumentCompleted += 
            new WebBrowserDocumentCompletedEventHandler(
                wb_DocumentCompleted);

        while(true )
        {
            beginTime = DateTime.Now;

            wb.Navigate(URL);

            while (wb.ReadyState != WebBrowserReadyState.Complete)
            {
            Thread.Sleep(new Random().Next(10,100));
                Application.DoEvents();
            }
        }               

        //wb.Dispose();                 
    }

    private void wb_DocumentCompleted(object sender, 
        WebBrowserDocumentCompletedEventArgs e)
    {
        WebBrowser wb = (WebBrowser)sender;
        if (wb.ReadyState == WebBrowserReadyState.Complete)
        {
            GeneratedSource= wb.Document.Body.InnerHtml;

            endTime = DateTime.Now;
            Console.WriteLine("WebBrowser " + (endTime-beginTime).Milliseconds + Thread.CurrentThread.Name + wb.Document.Title);            
        }
    } 
}

when it run, after a while (20-50 times), it throw the exception like this

EXCEPTION code=ACCESS_VIOLATION (null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(nul l)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(n ull)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null) (null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(null)(nul l)(null)BACKTRACE: 33 stack frames: #0 0x083dba8db0 at MatchExactGetIDsOfNames in mshtml.dll #1 0x0879f9b837 at StrongNameErrorInfo in mscorwks.dll #2 0x0879f9b8e3 at StrongNameErrorInfo in mscorwks.dll #3 0x0879f9b93a at StrongNameErrorInfo in mscorwks.dll #4 0x0879f9b9e0 at StrongNameErrorInfo in mscorwks.dll #5 0x0879f9b677 at StrongNameErrorInfo in mscorwks.dll #6 0x0879f9b785 at StrongNameErrorInfo in mscorwks.dll #7 0x0879f192a8 at InstallCustomModule in mscorwks.dll #8 0x0879f19444 at InstallCustomModule in mscorwks.dll #9 0x0879f194ab at InstallCustomModule in mscorwks.dll #10 0x0879fa6491 at StrongNameErrorInfo in mscorwks.dll #11 0x0879f44bcf at DllGetClassObjectInternal in mscorwks.dll #12 0x089bbafa at in #13 0x087b18cc10 at in System.Windows.Forms.ni.dll #14 0x087b91f4c1 at in System.Windows.Forms.ni.dll #15 0x08d00669 at in #16 0x08792d6e46 at in mscorlib.ni.dll #17 0x08792e02cf at in mscorlib.ni.dll #18 0x08792d6dc4 at in mscorlib.ni.dll #19 0x0879e71b4c at in mscorwks.dll #20 0x0879e896ce at in mscorwks.dll #21 0x0879e96ea9 at CoUninitializeEE in mscorwks.dll #22 0x0879e96edc at CoUninitializeEE in mscorwks.dll #23 0x0879e96efa at CoUninitializeEE in mscorwks.dll #24 0x0879f88357 at GetPrivateContextsPerfCounters in mscorwks.dll #25 0x0879e9cc8f at CoUninitializeEE in mscorwks.dll #26 0x0879e9cc2b at CoUninitializeEE in mscorwks.dll #27 0x0879e9cb51 at CoUninitializeEE in mscorwks.dll #28 0x0879e9ccdd at CoUninitializeEE in mscorwks.dll #29 0x0879f88128 at GetPrivateContextsPerfCounters in mscorwks.dll #30 0x0879f88202 at GetPrivateContextsPerfCounters in mscorwks.dll #31 0x0879f0e255 at InstallCustomModule in mscorwks.dll #32 0x087c80b729 at GetModuleFileNameA in KERNEL32.dll

i have try lots of methods to solve the problem, finally, i found that if i thread sleep more millseconds, it will run for a longer time, but the exception is still throw.

hope somebody give me the answer of how to slove ... thanks very much !!!