private void BtnAddPatient_Click(object sender, EventArgs e)
        {
            var frmAddEditPatient = new FrmAddEditPatient();

            frmAddEditPatient.Show();

            DisplayDataInListView(_manager.Search(RetrieveDataFromFilters()));
        }
        private void BtnEditPatient_Click(object sender, EventArgs e)
        {
            if (LvPatients.SelectedItems.Count > 0)
            {
                var frmAddEditPatient = new FrmAddEditPatient(LvPatients.SelectedItems[0].Tag as Patient);
                frmAddEditPatient.Show();
            }

            DisplayDataInListView(_manager.Search(RetrieveDataFromFilters()));
        }