private void NEW_GUEST_Load(object sender, EventArgs e)
        {
            String QRY = "SELECT id,country_name FROM country";

            CLS_METHODS.FILL_COMBOBOX(CMB_COUNTRY, QRY, "country_name", "id", -1);
            TXT_ID_NUMBER.Focus();
        }
 private void BTN_SAVE_Click(object sender, EventArgs e)
 {
     if (TXT_ID_NUMBER.Text.Length == 0)
     {
         TXT_ID_NUMBER.Focus();
         MSGBOX mdg = new MSGBOX(MessageAlertHeder.Alert(), "PLEASE ENTER ID NO!", MessageAlertImage.Alert());
         mdg.ShowDialog();
     }
     else if (TXT_FNAME.Text.Length == 0)
     {
         TXT_FNAME.Focus();
         MSGBOX mdg = new MSGBOX(MessageAlertHeder.Alert(), "PLEASE ENTER FIRST NAME!", MessageAlertImage.Alert());
         mdg.ShowDialog();
     }
     else if (TXT_LNAME.Text.Length == 0)
     {
         TXT_LNAME.Focus();
         MSGBOX mdg = new MSGBOX(MessageAlertHeder.Alert(), "PLEASE ENTER LAST NAME!", MessageAlertImage.Alert());
         mdg.ShowDialog();
     }
     else if (CMB_GENDER.SelectedIndex == -1)
     {
         CMB_GENDER.Focus();
         MSGBOX mdg = new MSGBOX(MessageAlertHeder.Alert(), "PLEASE SELECT GENDER TYPE!", MessageAlertImage.Alert());
         mdg.ShowDialog();
     }
     else if (CMB_COUNTRY.SelectedIndex == -1)
     {
         CMB_COUNTRY.Focus();
         MSGBOX mdg = new MSGBOX(MessageAlertHeder.Alert(), "PLEASE SELECT COUNTRY!", MessageAlertImage.Alert());
         mdg.ShowDialog();
     }
     else
     {
         groupBox2.Enabled = false;
         SAVE_GUEST();
         groupBox2.Enabled = true;
         BTN_NEW.Focus();
     }
 }