How do I..can close the form by asking a user to cose or not.

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C++

public ref class form3 : public System::Windows::Forms::Form
{
public:
    form3(void)
    {
    	InitializeComponent();
    	timer1->Start();
    	//
    	//TODO: Add the constructor code here
    	//
    }
    
protected:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~form3()
    {
    	if (components)
    	{
    		delete components;
    	}
    }

private: 
    System::Void timer1_Tick(System::Object^  sender, System::EventArgs^  e)
    {
        DateTime datetime = DateTime::Now;
        this->label1->Text=datetime.ToString();
    }

    System::Void form3_FormClosing(System::Object^ sender, System::Windows::Forms::FormClosingEventArgs^ e)
    {
        if (MessageBox::Show("Do you Really Want to Exit?","Form3", MessageBoxButtons::YesNo,MessageBoxIcon::Question) == (System::Windows::Forms::DialogResult::Yes))
        {
            timer1->Stop();      //i enabled timer
            //Application::Exit();
            form3::Close();	
        }
        else
        {
            e->Cancel=true;
        }
    }	
}

Here in this code,When i click "X" button on form ,it is asking to close or not,but Even though i choose 'yes'option, dialog box is not closing.