open a new Form from a button

this is my Form21.h :
#pragma once
#include "Form1.h"
#include <vector>
#include <string>

namespace interfaceProject {

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;

///

/// Description résumée de Form2
///

public ref class Form2 : public System::Windows::Forms::Form
{
public:
Form2()
: Form()
{
InitializeComponent();
//
//TODO: ajoutez ici le code du constructeur
//
}

protected:
///

/// Nettoyage des ressources utilisées.
///

~Form2()
{
if (components)
{
delete components;
}
}

private: System::Windows::Forms::DataGridView^ dataGridView1;
protected:

private:
///

/// Variable nécessaire au concepteur.
///

System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
///

/// Méthode requise pour la prise en charge du concepteur - ne modifiez pas
/// le contenu de cette méthode avec l'éditeur de code.
///

void InitializeComponent(void)
{
this->dataGridView1 = (gcnew System::Windows::Forms::DataGridView());
(cli::safe_cast<system::componentmodel::isupportinitialize^>(this->dataGridView1))->BeginInit();
this->SuspendLayout();
//
// dataGridView1
//
this->dataGridView1->ColumnHeadersHeightSizeMode = System::Windows::Forms::DataGridViewColumnHeadersHeightSizeMode::AutoSize;
this->dataGridView1->Location = System::Drawing::Point(12, 12);
this->dataGridView1->Name = L"dataGridView1";
this->dataGridView1->Size = System::Drawing::Size(524, 150);
this->dataGridView1->TabIndex = 1;
this->dataGridView1->CellContentClick += gcnew System::Windows::Forms::DataGridViewCellEventHandler(this, &Form2::dataGridView1_CellContentClick);
//
// Form2
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(566, 262);
this->Controls->Add(this->dataGridView1);
this->Name = L"Form2";
this->Text = L"Form2";
(cli::safe_cast<system::componentmodel::isupportinitialize^>(this->dataGridView1))->EndInit();
this->ResumeLayout(false);

}
#pragma endregion
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {

}
private: System::Void dataGridView1_CellContentClick(System::Object^ sender, System::Windows::Forms::DataGridViewCellEventArgs^ e) {
dataGridView1->AutoResizeColumnHeadersHeight();

// Resize all the row heights to fit the contents of all non-header cells.
dataGridView1->AutoResizeRows(
DataGridViewAutoSizeRowsMode::AllCellsExceptHeaders);
// Set the column header names.

// Create an unbound DataGridView by declaring a column count.
dataGridView1->ColumnCount = 4;
dataGridView1->ColumnHeadersVisible = true;

// Set the column header style.
DataGridViewCellStyle ^ columnHeaderStyle = gcnew DataGridViewCellStyle;
columnHeaderStyle->BackColor = Color::Aqua;
columnHeaderStyle->Font = gcnew System::Drawing::Font( "Verdana",10,FontStyle::Bold );
dataGridView1->ColumnHeadersDefaultCellStyle = columnHeaderStyle;

// Set the column header names.
dataGridView1->Columns[ 0 ]->Name = "Recipe";
dataGridView1->Columns[ 1 ]->Name = "Category";
dataGridView1->Columns[ 2 ]->Name = "Main Ingredients";
dataGridView1->Columns[ 3 ]->Name = "Rating";

// Populate the rows.
array<string^>^row1 = gcnew array<string^>{
"Meatloaf","Main Dish","ground beef","**"
};
array<string^>^row2 = gcnew array<string^>{
"Key Lime Pie","Dessert","lime juice, evaporated milk","****"
};
array<string^>^row3 = gcnew array<string^>{
"Orange-Salsa

thank you i found the solution:) have a nice day