dropdownValidate static method
      
dynamic
dropdownValidate({})
      
     
    
    
Implementation
static dynamic dropdownValidate(
    {required dynamic selectValue,
    required String dummyValue,
    required String fieldName}) {
  return selectValue == null ||
          selectValue.toString().trim() == '' ||
          selectValue.toString().toUpperCase() == dummyValue.toUpperCase()
      ? "Please Select $fieldName"
      : null;
}