public frmPatientDataUpdate(string PatientID)
        {
            InitializeComponent();
            dtpVST.DateTime = DateTime.Now.Date;
            PID             = PatientID;

            Patient        p  = new Patient();
            PatientContext px = new PatientContext();

            p           = px.GetPatient(PatientID);
            txtPID.Text = p.ID;
            txtPNM.Text = p.PatientName;
            txtADR.Text = p.Address;
            txtPHN.Text = p.PhoneNo;

            MedicineContext mx = new MedicineContext();
            ServerToClient  sc = new ServerToClient();

            sc = mx.GetMedicines();

            for (int i = 0; i <= sc.Count - 1; i++)
            {
                cboMED.Properties.Items.Add(sc.DT.Rows[i].ItemArray[0].ToString());
            }
        }
        private void cboMED_KeyDown(object sender, KeyEventArgs e)
        {
            ServerToClient  sc = new ServerToClient();
            MedicineContext mx = new MedicineContext();
            Medicine        m  = new Medicine();

            if (e.KeyCode == Keys.Enter)
            {
                if (!dxValidationProvider1.Validate())
                {
                    return;
                }
                if (cboMED.SelectedIndex == -1)
                {
                    m.MedicineName = cboMED.Text;
                    sc             = mx.AddMedicine(m);
                }
                lstMED.Items.Add(cboMED.Text);
                cboMED.SelectedIndex = -1;
            }
        }