Preventing a dialog from closing in the button's click event handler

Question

I have a dialog that I show with .ShowDialog(). It has an OK button and a Cancel button; the OK button also has an event handler.

I want to

Answer 1

Just add one line in the event function

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) 
             {
                this->DialogResult = System::Windows::Forms::DialogResult::None;
             }