private void btn_deletePatient_Click(object sender, EventArgs e)
        {
            try
            {
                // Get the patient ID from the application
                patient.PatientId = Convert.ToInt32(txtbx_patientID.Text);
                bool success = patient.Delete(patient);
                if (success)
                {
                    // Successfully deleted
                    MessageBox.Show("Patient deleted successfully.");

                    // Call the method to refresh DataGrid view after deletion.
                    LoadPatientDgvData();

                    // Call the method to clear all input/selection fields.
                    Clear();
                }
                else
                {
                    // Delete failed
                    MessageBox.Show("Failed to delete patient. Try again.");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }