Ошибки С2065

#pragma once
#include <iostream>
extern int global_int;
 
namespace OOP3 {
 
 
 
    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;
 
    /// <summary>
    /// Сводка для MyForm1
    /// </summary>
    public ref class MyForm1 : public System::Windows::Forms::Form
    {
 
    public:
        MyForm1(void)
        {
            InitializeComponent();
            
            extern int h;
            extern int m;
        }

#pragma endregion
    private: System::Void Button1_Click(System::Object^ sender, System::EventArgs^ e) {
        h = Convert::ToInt32(textBox1->Text);
        m = Convert::ToInt32(textBox1->Text);
    }

private: System::Void ВысотаСтрокToolStripMenuItem_Click(System::Object^ sender, System::EventArgs^ e) {
    MyForm1^ f = gcnew MyForm1();
    this->Hide();
    f->ShowDialog();
    this->Show();
    for (int i = 0; i < dataGridView1->RowCount; i++) {
        DataGridViewRow^ row = dataGridView1->Rows[i];
        row->Height = h;
    }
 
}
private: System::Void ШиринаСтолбцовToolStripMenuItem_Click(System::Object^ sender, System::EventArgs^ e) {
    MyForm1^ f = gcnew MyForm1();
    this->Hide();
    f->ShowDialog();
    this->Show();
    for (int i = 0; i < dataGridView1->ColumnCount; i++) {
        DataGridViewColumn^ column = dataGridView1->Columns[i]; column->Width = m;
    }
}