protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //populate ddl_repeatForWks
                for (int i = 0; i <= 20; i++)
                {
                    ddl_repeatWks.Items.Add(i.ToString());
                }

                //populate ddl_timeH
                int h = 00;
                for (int i = 0; i < 24; i++)
                {
                    ddl_timeH.Items.Add(h.ToString("D2"));
                    h++;
                }

                //populate ddl_timeM
                int m = 00;
                for (int i = 0; i <= 59; i++)
                {
                    ddl_timeM.Items.Add(m.ToString("D2"));
                    m++;
                }

                //populate ddl_capacity
                for (int i = 6; i <= 20; i++)
                {
                    ddl_capacity.Items.Add(i.ToString());
                }

                //populate duration [session]
                for (int i = 60; i <= 90; i = i + 10)
                {
                    ddl_duration.Items.Add(i.ToString());
                }
            }
            //get list of instructors to be displayed in ddl_instructors
            instructors = DBconnection.getInstructorsList();
        }