private void dataGrid_MyPrescriptions_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            this.indexSelected = dataGrid_MyPrescriptions.SelectedIndex;
            if (indexSelected == -1 || presList.Count <= indexSelected)
            {
                presSelected            = null;
                updteBtn_pres.IsEnabled = false;
                return;
            }
            ;


            updteBtn_pres.IsEnabled = true;
            //presSelected = (prescription)presList.ElementAt<prescription>(dataGrid_Pres.SelectedIndex);
            presSelected = (Prescription)dataGrid_MyPrescriptions.SelectedItem;
            if (presSelected.Patient == null)
            {
                return;
            }

            else if (presSelected.Patient.pat_type != null)
            {
                mypresc_pattype.Text = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(presSelected.Patient.pat_type);
            }
            if (presSelected.Patient.pat_type.Equals("outdoor"))
            {
                mypresc_disease.IsEnabled = false;
            }
            else if (presSelected.Patient.pat_type.Equals("indoor"))
            {
                IndoorPatient indo = hmsfac.getIndoorByPid(presSelected.pat_id);
                mypresc_disease.IsEnabled = true;
                mypresc_disease.Text      = indo.indpat_disease;
            }

            mypresc_med.Text    = presSelected.Medicine.med_name;
            mypresc_dosage.Text = presSelected.presc_dosage;
        }