Access violation Issue in MultiThreading

**Description:** The Access violation Issue in MultiThreading Language: VB .NET 2005 Description: We are creating an instance of webbrowser control object internally in the code, and assign an html text to its “DocumentText?? property. When the [login to view URL] = [login to view URL], we are accessing the parsed html Document object and using it for some operations. The Webbrowser control is not in the GUI , it is created dynamically and never displayed. ## Deliverables **Description:** The Access violation Issue in MultiThreading Language: VB .NET 2005 Description: We are creating an instance of webbrowser control object internally in the code, and assign an html text to its “DocumentText?? property. When the [login to view URL] = [login to view URL], we are accessing the parsed html Document object and using it for some operations. The Webbrowser control is not in the GUI , it is created dynamically and never displayed. We are using multithreading and every thread created does the above process. These threads work independently , and their appartment state is STA ([login to view URL]). The process in the thread reads HTML tags and parse them using the webbrowser object created. Problem: The threads gets created and starts fine. After a few iterations we gets the error “Attempted to read or write protected memory. This is often an indication that other memory is corrupt.?? And the StackTrace of the Exception was [login to view URL]() at System.Windows.Forms.WebBrowser.get_Document() at System.Windows.Forms.WebBrowser.get_ReadyState() Tried Fixes: [login to view URL] the webbrowser object Shared wbAds As WebBrowser 2. Called [login to view URL]() after every iterations [login to view URL] the Thread Sleep interval. This fixes didn’t sloved the problem Our Code model with threading Private sub subThreadCaller() Dim trdAnalysis() as Thread Dim i,j as int16 J=5 Redim trdAnalysis(j) For i = 0 To j trdAnalysis(i) = New Thread(New ThreadStart (AddressOf subProcWeb)) trdAnalysis(i).SetApartmentState([login to view URL]) trdAnalysis(i).Name = "Thread" & i trdAnalysis(i).IsBackground = True trdAnalysis(i).Start() [login to view URL](50) Next i End Sub Private Sub subProcWeb() Dim wbo As WebBrowser Dim htmlDoc As HtmlDocument Dim strHtm as string Dim i, j as int32 J=1000 For i = 0 to j strHtml = wbo = new WebBrowser [login to view URL] = strHtml [login to view URL] = True While Not [login to view URL] = [login to view URL] [login to view URL]() [login to view URL](1000) End While While [login to view URL] = True [login to view URL]() [login to view URL](1000) End While htmlDoc= [login to view URL] ... Processing follows... [login to view URL]() [login to view URL](100) Next i End Sub Our Requirement is to check our web pages for a certain condition . For this we read the HTML source of the page and assigin it to a webbrowser object. Then check the parsed htmldocument. Since analysising the HTML Document object was most suited for our need than using regular expression on the html source file. Thanks