/** set province data member into combobox **/
 public static void SetProvinceBox(ComboBox comboProvince)
 {
     comboProvince.DataSource    = ProvinceModel.getProvinceList(); // create datasource into combobox
     comboProvince.DisplayMember = ProvinceModel.ENTITY.NAME_ENG;   // set for display what to show.
     comboProvince.ValueMember   = ProvinceModel.ENTITY.CODE;       // set for value member when selected.
 }