'Declaration

Public Property required As Boolean

public bool required { get; set; }

public: __property bool get_required();
public: __property void set_required(
   bool value
);

public:
property bool required {
   bool get();
   void set(bool value);
}

True - the field's value must be non-null when the user clicks a submit button that causes the value of the field to be posted. If the field value is null, the user receives a warning message and the submit does not occur.