ASP.NET J# Anyone?

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Hey does anyone know how to code ASP.NET J# because im kind of in a dead lock.

On my virtual directory I have my default.aspx file. however I have a Page_Load function that reads one of my classes which gets the calling file.

but just for a test I decided to do the following

    protected void Page_Load(Object sender, EventArgs e)
    {
        String part = "Revolution Gamers - ";
        String part2 = "";


            part2 = System.IO.Path.GetFileName(HttpContext.get_Current().get_Request().get_FilePath());

            if (part2 == "default.aspx" ||
                part2 == "Default.aspx")
            {
                part2 = "Index";
                
            }
            else
            {
                
            }

        StringBuilder sb = new StringBuilder();
        sb.Append(part);
        sb.Append(part2);

        set_Title(sb.toString());
    }

Ok I got that out of the way but when i call my Default.aspx file. the title shows up as "Revolution Gamers - Default.aspx" and its not showing what I instructed it to show. how come? or should I change that and put it inside the StringBuilder?