protected void Button1_Click(object sender, EventArgs e)
    {
        CoursesClass s = new CoursesClass();
            s.ID = Convert.ToInt32(Request.QueryString["CourseID"]);

                s.Contain = Server.MapPath("UploadFiles\\Courses\\Details\\" + s.ID.ToString());
                msgLabel.Text = s.UpdateDetails();
                File.WriteAllText(s.Contain, ASPxHtmlEditor1.Html);
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            {
                CoursesClass s = new CoursesClass();
                s.ID = Convert.ToInt32(Request.QueryString["CourseID"]);

                if(File.Exists(Server.MapPath("UploadFiles\\Courses\\Details\\" + s.ID.ToString())))
                ASPxHtmlEditor1.Html = File.ReadAllText(Server.MapPath("UploadFiles\\Courses\\Details\\" + s.ID.ToString()));

            }
    }