Question

Do you know why I always got this exception?

this is my code

private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
    {
        toolStripProgressBar1.Maximum = (int)e.MaximumProgress;
        toolStripProgressBar1.Value = (int)e.CurrentProgress;
    }

I would appreciate any answer, thank you.

Answer 1

According to documentation – property CurrentProgress of event argument class WebBrowserProgressChangedEventArgs has value -1 when download is complete.

Please use following code to ensure that progress bar completely reflects status of the download:

    private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
    {
        toolStripProgressBar1.Maximum = (int)e.MaximumProgress;
        toolStripProgressBar1.Value = ((int)e.CurrentProgress < 0 || (int)e.MaximumProgress < (int)e.CurrentProgress) ? (int)e.MaximumProgress : (int)e.CurrentProgress;
    }