c# filenotfoundexception on webbrowser?

Question

if (webBrowser1.DocumentText.IndexOf(\"Page: 1\") != -1)

on the above line i am getting this exception

System.IO.FileNotFoun

Answer 1

I too found it strange that the web browser control was throwing an exception related to file access, when I was loading a page from the web.

When looking into this, I noticed something strange: This error is far less common when the temporary internet files have recently been cleared.

I modified my application so that it clears the temporary internet files automatically when the application starts, which was enough to resolve 90% of these errors.

My code for cleaning the temporary internet files is below... I don't think this will work on all operating systems - there may be a better way - but this suits my needs because it works on Server 2008.

(my code is in vb.net, but the c# version shouldn't be too hard to figure out.)

        'start cleaning the temporary internet files
        Dim clearFilesProcess As Process = System.Diagnostics.Process.Start("rundll32.exe", "InetCpl.cpl,ClearMyTracksByProcess 255")

        'wait for the temporary internet files to be deleted
        While Not (clearFilesProcess.HasExited)
            System.Threading.Thread.Sleep(200)
        End While