Ошибка при открытии диалогового окна выбора файла

private: System::Void btnOpen_Click(System::Object^  sender, System::EventArgs^  e) {
         if (openFileDialog1->ShowDialog()==System::Windows::Forms::DialogResult::OK){
         StreamReader ^  sr = gcnew StreamReader(openFileDialog1->FileName);
         }
}

#pragma once
 
namespace Project1 {
 
    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;
    using namespace System::Collections::Generic;
    using namespace System::IO;
 
        /// <summary>
    /// Summary for MyForm
    /// </summary>
    public ref class MyForm : public System::Windows::Forms::Form
    {
    public:
        MyForm(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }
 
    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~MyForm()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::Button^  btnOpen;
    private: System::Windows::Forms::Button^  btnSave;
    private: System::Windows::Forms::Label^  lblPath;
    protected:
 
 
    private: System::Windows::Forms::TextBox^  textBox1;
    private: System::Windows::Forms::SaveFileDialog^  saveFileDialog1;
    private: System::Windows::Forms::OpenFileDialog^  openFileDialog1;
 
    protected:
 
    private:
        /// <summary>
        /// Required designer variable.
        /// </summary>
        System::ComponentModel::Container ^components;
 
#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->btnOpen = (gcnew System::Windows::Forms::Button());
            this->btnSave = (gcnew System::Windows::Forms::Button());
            this->lblPath = (gcnew System::Windows::Forms::Label());
            this->textBox1 = (gcnew System::Windows::Forms::TextBox());
            this->saveFileDialog1 = (gcnew System::Windows::Forms::SaveFileDialog());
            this->openFileDialog1 = (gcnew System::Windows::Forms::OpenFileDialog());
            this->SuspendLayout();
            // 
            // btnOpen
            // 
            this->btnOpen->Location = System::Drawing::Point(0, 0);
            this->btnOpen->Name = L"btnOpen";
            this->btnOpen->Size = System::Drawing::Size(75, 23);
            this->btnOpen->TabIndex = 0;
            this->btnOpen->Text = L"Open";
            this->btnOpen->UseVisualStyleBackColor = true;
            this->btnOpen->Click += gcnew System::EventHandler(this, &MyForm::btnOpen_Click);
            // 
            // btnSave
            // 
            this->btnSave->Location = System::Drawing::Point(0, 212);
            this->btnSave->Name = L"btnSave";
            this->btnSave->Size = System::Drawing::Size(75, 23);
            this->btnSave->TabIndex = 1;
            this->btnSave->Text = L"Save";
            this->btnSave->UseVisualStyleBackColor = true;
            // 
            // lblPath
            // 
            this->lblPath->AutoSize = true;
            this->lblPath->Location = System::Drawing::Point(12, 240);
            this->lblPath->Name = L"lblPath";
            this->lblPath->Size = System::Drawing::Size(0, 13);
            this->lblPath->TabIndex = 2;
            // 
            // textBox1
            // 
            this->textBox1->Location = System::Drawing::Point(0, 29);
            this->textBox1->Multiline = true;
            this->textBox1->Name = L"textBox1";
            this->textBox1->Size = System::Drawing::Size(272, 177);
            this->textBox1->TabIndex = 3;
            // 
            // openFileDialog1
            // 
            this->openFileDialog1->FileName = L"openFileDialog1";
            // 
            // MyForm
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(284, 262);
            this->Controls->Add(this->textBox1);
            this->Controls->Add(this->lblPath);
            this->Controls->Add(this->btnSave);
            this->Controls->Add(this->btnOpen);
            this->Name = L"MyForm";
            this->Text = L"MyForm";
            this->ResumeLayout(false);
            this->PerformLayout();
 
        }
#pragma endregion
    private: System::Void btnOpen_Click(System::Object^  sender, System::EventArgs^  e) {
                         if (openFileDialog1->ShowDialog()==System::Windows::Forms::DialogResult::OK){
                             StreamReader ^  sr = gcnew StreamReader(openFileDialog1->FileName);
                             MessageBox::Show(sr->ReadToEnd());
                             sr->Close();
                         }
    }
};
}

#include "MyForm.h"
#include <iostream>
using namespace std;
int main()
{
    cout << "Hello!";
    system("pause");
    return 0;
}

#include "MyForm.h"
 
using namespace System;
using namespace System::Windows::Forms;
 
[STAThreadAttribute]
void main(array<String^>^ args)
{
    Application::EnableVisualStyles();
    Application::SetCompatibleTextRenderingDefault(false);
    Project1::MyForm form;
    Application::Run(%form);
}