private void BtnAddPrescription_Click(object sender, EventArgs e)
        {
            var patient = patients[lstPatients.SelectedIndices[0]];
            var form    = new D_PrescriptionForm(Employee, patient, p =>
            {
                LoadPrescription();
            });

            form.ShowDialog(this);
        }
        private void LstPrescription_DoubleClick(object sender, EventArgs e)
        {
            var patient      = patients[lstPatients.SelectedIndices[0]];
            var prescription = prescriptions[lstPrescription.SelectedIndex];
            var form         = new D_PrescriptionForm(Employee, patient, p =>
            {
                LoadPrescription();
            }, prescription);

            form.ShowDialog(this);
        }