C#

<br />
    private UserStats userStats;<br />
<br />
    protected void Session_Start(object sender, EventArgs e)<br />
    {<br />
        if ((UserStats)Session["UserStats"] != null)<br />
        {<br />
            userStats = (UserStats)Session["UserStats"];<br />
        }<br />
    }<br />
<br />
    protected string PageBasePath<br />
    {<br />
        get<br />
        {<br />
            string basePathString = string.Format("{0}://{1}{2}", Request.Url.Scheme, Request.Url.Authority, Request.ApplicationPath);<br />
            if (!basePathString.EndsWith("/")) basePathString = basePathString + "/";<br />
            return basePathString;<br />
        }<br />
    }<br />
<br />
    protected bool Compare(String x, String y)<br />
    {<br />
        Regex rg = new Regex(y);<br />
        return rg.IsMatch(x);<br />
    }<br />
<br />
    protected void Application_PreRequestHandlerExecute(object sender, EventArgs e)<br />
    {<br />
<br />
        String ExtendsPermissions = "aspx|jpg|png"; <br />
        String page = HttpContext.Current.Request.Path.ToString();         <br />
        try<br />
        {<br />
            String expression = @"(/MYSITE/DIRECTORY/)(([a-zA-Z0-9_\/]+)*)\.(" + ExtendsPermissions + ")$";<br />
            if (Compare(page, expression ) && userStats.Permission.Equals("DIRECTORY") )<br />
            {                <br />
                // Stay in this page!<br />
            }<br />
            else<br />
            {<br />
		// I tried here, but it doesn't work<br />
                //HttpContext.Current.RewritePath("Default.aspx"); // my proble is in some place here.<br />
<br />
		// I tried here too, but it doesn't work too.<br />
                HttpContext.Current.Response.Redirect(PageBasePath); // my proble is in some place here.<br />
<br />
                // to to defalt page root<br />
            }<br />
        }<br />
        catch (Exception ex)<br />
        {<br />
            Response.Write(ex.Message);<br />
        }<br />
    }<br />