private void btnSave_Click(object sender, EventArgs e)
 {
     if (valid())
     {
         PatientHistory objPatientHistory = new PatientHistory();
         objPatientHistory.Paid          = "Y";
         objPatientHistory.Datemodified  = System.DateTime.Now;
         objPatientHistory.Modifiedby    = this.sessionKey;
         objPatientHistory.Appointmentid = Convert.ToInt32(cbAppointmentDetails.SelectedItem.ToString().Split('|')[0].Trim());
         objPatientHistory.UpdatePatientHistory(objPatientHistory);
         DisplayMessage("Payment Done.", "Successful..!!", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2);
         ClearAppointmentDetails();
         Clear();
         objAppointment.GetAppointmentList(cbAppointmentDetails);
     }
 }