2D Graphics Visual C++ .NET

using namespace System;
  using namespace System::ComponentModel;
  using namespace System::Collections;
  using namespace System::Windows::Forms;
  using namespace System::Data;
  using namespace System::Drawing;
  public ref class Form1 : public System::Windows::Forms::Form
  {
  public:
    Form1(void)
    {
            this->Size = System::Drawing::Size(300,300);
            this->Text = L"Hello GDI+";
            this->Padding = System::Windows::Forms::Padding(0);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
    }
        virtual void OnPaint(System::Windows::Forms::PaintEventArgs ^e) override
        {
            Form::OnPaint(e);
            Graphics ^g = e->Graphics;
            g->DrawString("Hello World!", 
                gcnew Drawing::Font("Arial", 16), Brushes::Black, 75.0, 110.0);
        }
  };
[STAThreadAttribute]
int main(array ^args)
{
  Application::Run(gcnew Form1());
  return 0;
}