private void AddMedicine()
 {
     AddedMedicine.Add(new SelectedMedicine {
         SerialNumber = counter, medicine = this.MedicineName
     });
     this.MedicineName = string.Empty;
     counter++;
 }
        private void GetMedicineDetails(string BillID)
        {
            string    sql = "select MedicineName from billmedicinemapping where billid='" + BillID + "'";
            DataTable dt  = DAL.Select(sql);

            AddedMedicine.Clear();
            foreach (DataRow dr in dt.Rows)
            {
                AddedMedicine.Add(new SelectedMedicine {
                    SerialNumber = 0, medicine = dr["MedicineName"].ToString()
                });
            }
        }