private void OpenSelectedPatientProfile()
        {
            int id;

            if (txtFilter.Text == "")
            {
                id = patients[dgvPatientInfoDisplay.CurrentRow.Index].Id;
            }
            else
            {
                id = filteredPatients[dgvPatientInfoDisplay.CurrentRow.Index].Id;
            }

            Patient        patient = database.loadPatient(id);
            PatientProfile pp      = new PatientProfile(patient);

            pp.ShowDialog();
        }