Clr/ visual c++

#include "Properties.h"

#ifndef SYMBOL_H_
#define SYMBOL_H_
class ProPerties
{
public:
    int a;
    ProPerties();
    ~ProPerties();
};
#endif

#include "Properties.h"
using namespace System;
 
ProPerties::ProPerties()
{
    this->a = 5;
    lbl_next->Text = L"Next"; // Здесь ошибка
}
 
ProPerties::~ProPerties()
{
}

#pragma once
#include "Properties.h"
namespace test {
 
    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>
    /// Summary for main
    /// </summary>
    public ref class main : public System::Windows::Forms::Form
    {
    public:
        main(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }
 
    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~main()
        {
            if (components)
            {
                delete components;
            }
        }
    public: System::Windows::Forms::Label^  lbl_next;
    protected:
 
    protected:
 
    public:
        /// <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->lbl_next = (gcnew System::Windows::Forms::Label());
            this->SuspendLayout();
            // 
            // lbl_next
            // 
            this->lbl_next->AutoSize = true;
            this->lbl_next->Location = System::Drawing::Point(218, 158);
            this->lbl_next->Name = L"lbl_next";
            this->lbl_next->Size = System::Drawing::Size(35, 13);
            this->lbl_next->TabIndex = 0;
            this->lbl_next->Text = L"label1";
            // 
            // main
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(284, 261);
            this->Controls->Add(this->lbl_next);
            this->Name = L"main";
            this->Text = L"main";
            this->ResumeLayout(false);
            this->PerformLayout();
 
        }
#pragma endregion
    };
}

    public:static System::Windows::Forms::Label^  lbl_next;

test::main obj;

test::main ^ obj;

#ifndef SYMBOL_H_
#define SYMBOL_H_
 
class test::main;
 
class ProPerties
{
public:
    test::main* p;
    int a;
    ProPerties();
    ~ProPerties();
};
#endif
 
#include "Properties.h"
#include "main.h"
using namespace System;
 
ProPerties::ProPerties()
{
    this->a = 5;
    p = new test::main();
    p ->lbl_next->Text = L"Next"; 
}

class test::main;