Question

I would like to make a test , first of all redirecting to a blank page and then just after redirecting to a normal page, but it looks like it doesnt make the second redirect …

Browser.Base = Constants.ParkInfoDirectory;    //  "ParkInfo" folder
string s = string.Format("{0}/section_{1}.html", _parkId, _parkPage);    
//  URL = "/ParkInfo/ti217/5" for page 5 of Rainier

string blank = string.Format("{0}/Blank.html", _parkId);
Browser.Navigate(new Uri(blank, UriKind.Relative));
this.Browser.UpdateLayout();
Browser.Navigate(new Uri(s, UriKind.Relative));
this.Browser.UpdateLayout();

New version :

            string s = string.Format("{0}/section_{1}.html", _parkId, _parkPage);    //  URL = "/ParkInfo/ti217/5" for page 5 of Rainier
            string blank = string.Format("{0}/section_blank.html", _parkId);
            Uri blank_ = new Uri(blank, UriKind.Relative);
            Browser.Navigate(new Uri(blank, UriKind.Relative));
            Browser.Navigated += new EventHandler<System.Windows.Navigation.NavigationEventArgs>(Browser_Navigated);
            {
                if (e.Uri == blank_)
                {
                    Browser.Navigate(new Uri(s, UriKind.Relative));
                }
            };
            Browser.Navigate(blank_);

Answer 1

You call two navigate method in one UI thread execution. It can cause some issues with that. Try to put second Navigate inside Dispatcher to delay it execution or subscribe to Navigated event and call second Navigate from it

Browser.Navigate(new Uri(blank, UriKind.Relative));
Dispatcher.BeginInvoke(() =>
{
    Browser.Navigate(new Uri(s, UriKind.Relative)); 
});

Or:

Uri blank_ = new Uri(blank, UriKind.Relative)
Browser.Navigated += (s, e) =>
{
    if (e.Uri == blank_)
    {
        Browser.Navigate(new Uri(s, UriKind.Relative)); 
    }
};
Browser.Navigate(blank_);