GUI Form Visual C++ .NET

[STAThreadAttribute]
int main(array ^args)
{
  Application::Run(gcnew Form1());
  return 0;
}
  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)
    {
      InitializeComponent();
    }
  private:
    void InitializeComponent(void)
    {
            this->SuspendLayout();
            //
            // Form1
            //
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(292, 273);
            this->Name = L"Form1";
            this->Text = L"Common Color Dialog - Click Form";
            this->Click +=
                gcnew System::EventHandler(this, &Form1::Form1_Click);
            this->ResumeLayout(false);
    }
        System::Void Form1_Click(System::Object^ sender, System::EventArgs^ e)
        {
            ColorDialog^ colordialog = gcnew ColorDialog();
            if (colordialog->ShowDialog() ==
                System::Windows::Forms::DialogResult::OK)
            {
                BackColor = colordialog->Color;
            }
        }
  };