private void panel1_Paint(object sender, PaintEventArgs e)
 {
     try
     {
         object            result = emp.retAppInfo(int.Parse(id));
         Appointment_Table ap     = (Appointment_Table)result;
         DateTime          date   = (DateTime)ap.Date;
         var d = date.Date;
         label7.Text       = d.Day.ToString() + "/" + d.Month.ToString() + "/" + d.Year.ToString();
         richTextBox1.Text = ap.Purpose;
         label1.Text       = ap.Time;
         refresh();
     }
     catch (Exception)
     {
     }
 }