Ссылка на неразрешенную лексему и на неразрешенный внешний символ. c++/clr

Я никак не могу вызвать функцию LoginT() которая находится в файле MyForm.cpp из файла заголовка MyForm.h Также пытался использовать __declspec(dllexport) но была ошибка с3395 __declspec(dllexport) невозможно применять к функции с соглашение вызова __clrcall MyForm.cpp

#include "MyForm.h"
#include <Windows.h>
#include <mysql.h>
#include <msclr\marshal_cppstd.h>
#include <TlHelp32.h>

using namespace Interface1;// Название проекта

using namespace std;
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int) {
    Application::EnableVisualStyles();
    Application::SetCompatibleTextRenderingDefault(false);
    Application::Run(gcnew MyForm);
    return 0;
}

int qstate;
wstring hwidWString;
HW_PROFILE_INFO hwProfileInfo;
bool isLoginned;


void LoginT(System::String^ login, System::String^ password)
{
    GetCurrentHwProfile(&hwProfileInfo);
    hwidWString = hwProfileInfo.szHwProfileGuid;
    string hwid(hwidWString.begin(), hwidWString.end());
    char chars[] = "{}";

    for (unsigned int i = 0; i < strlen(chars); ++i)
    {
        // you need include <algorithm> to use general algorithms like std::remove()
        hwid.erase(std::remove(hwid.begin(), hwid.end(), chars[i]), hwid.end());
    }
    //Конвертация System::String в std::string
    msclr::interop::marshal_context context;
    std::string LoginString = context.marshal_as<std::string>(login);

    std::string PasswordString = context.marshal_as<std::string>(login);


    //Подключение к mysql
    MYSQL* conn;
    MYSQL_ROW row;
    MYSQL_RES* res;
    conn = mysql_init(0);
    conn = mysql_real_connect(conn, "localhost", "root", "root", "testdb1", 3307, NULL, 0);
    if (conn) {
        string query = "SELECT * FROM table1 WHERE `login` = \"" + LoginString + "\" AND `password` = \"" + PasswordString + "\ AND `hwid` = \"" + hwid + "\"";
        const char* q = query.c_str();
        qstate = mysql_query(conn, q);
        if (!qstate)
        {
            res = mysql_store_result(conn);
            while (row = mysql_fetch_row(res))
            {
                isLoginned = true;

            }
        }
        else
        {
            string query = "SELECT * FROM table1 WHERE `login` =\"" + LoginString + "\" AND `password` = \"" + PasswordString + "\ AND `hwid` = NULL";
            const char* q = query.c_str();
            qstate = mysql_query(conn, q);
            if (!qstate)
            {
                string query = "UPDATE table1 WHERE `login` = \"" + LoginString + "\" AND `password` = \"" + PasswordString + "\" SET `hwid` = \"" + hwid + "\"";

                const char* q = query.c_str();
                qstate = mysql_query(conn, q);

            }
            else {
                bool a = false;
                Interface1::MyForm::check(false);
            }
        }
    }
}

MyForm.h

#pragma once
#include <string>
#include <string.h>
#include <Windows.h>

std::string a;
namespace Interface1 {

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

    void LoginT(System::String^ login, System::String^ password);
    /// <summary>
    /// Сводка для MyForm
    /// </summary>
    public ref class MyForm : public System::Windows::Forms::Form
    {
        
    public:
        MyForm(void)
        {
            InitializeComponent();
            //
            //TODO: добавьте код конструктора
            //
        }

    protected:
        /// <summary>
        /// Освободить все используемые ресурсы.
        /// </summary>
        ~MyForm()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::Button^ button1;
    private: System::Windows::Forms::Label^ TextHello;
    private: System::Windows::Forms::TextBox^ Login;
    private: System::Windows::Forms::TextBox^ Password;


    private: System::Windows::Forms::Label^ label1;
    private: System::Windows::Forms::Label^ label2;

    protected:

    private:
        /// <summary>
        /// Обязательная переменная конструктора.
        /// </summary>
        System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
        /// <summary>
        /// Требуемый метод для поддержки конструктора — не изменяйте 
        /// содержимое этого метода с помощью редактора кода.
        /// </summary>
        void InitializeComponent(void)
        {
            this->button1 = (gcnew System::Windows::Forms::Button());
            this->TextHello = (gcnew System::Windows::Forms::Label());
            this->Login = (gcnew System::Windows::Forms::TextBox());
            this->Password = (gcnew System::Windows::Forms::TextBox());
            this->label1 = (gcnew System::Windows::Forms::Label());
            this->label2 = (gcnew System::Windows::Forms::Label());
            this->SuspendLayout();
            // 
            // button1
            // 
            this->button1->Font = (gcnew System::Drawing::Font(L"Microsoft YaHei UI", 25, System::Drawing::FontStyle::Bold));
            this->button1->Location = System::Drawing::Point(108, 314);
            this->button1->Name = L"button1";
            this->button1->Size = System::Drawing::Size(165, 67);
            this->button1->TabIndex = 0;
            this->button1->Text = L"Login";
            this->button1->UseVisualStyleBackColor = true;
            this->button1->Click += gcnew System::EventHandler(this, &MyForm::button1_Click);
            // 
            // TextHello
            // 
            this->TextHello->AutoSize = true;
            this->TextHello->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 25));
            this->TextHello->Location = System::Drawing::Point(101, 9);
            this->TextHello->Name = L"TextHello";
            this->TextHello->Size = System::Drawing::Size(186, 39);
            this->TextHello->TabIndex = 1;
            this->TextHello->Text = L"Hello User!";
            // 
            // Login
            // 
            this->Login->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 15));
            this->Login->Location = System::Drawing::Point(163, 85);
            this->Login->Name = L"Login";
            this->Login->Size = System::Drawing::Size(170, 30);
            this->Login->TabIndex = 2;
            // 
            // Password
            // 
            this->Password->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 15));
            this->Password->Location = System::Drawing::Point(163, 180);
            this->Password->Name = L"Password";
            this->Password->Size = System::Drawing::Size(170, 30);
            this->Password->TabIndex = 3;
            // 
            // label1
            // 
            this->label1->AutoSize = true;
            this->label1->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 25));
            this->label1->Location = System::Drawing::Point(12, 77);
            this->label1->Name = L"label1";
            this->label1->Size = System::Drawing::Size(101, 39);
            this->label1->TabIndex = 4;
            this->label1->Text = L"Login";
            // 
            // label2
            // 
            this->label2->AutoSize = true;
            this->label2->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 23));
            this->label2->Location = System::Drawing::Point(6, 174);
            this->label2->Name = L"label2";
            this->label2->Size = System::Drawing::Size(151, 35);
            this->label2->TabIndex = 5;
            this->label2->Text = L"Password";
            // 
            // MyForm
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(393, 393);
            this->Controls->Add(this->label2);
            this->Controls->Add(this->label1);
            this->Controls->Add(this->Password);
            this->Controls->Add(this->Login);
            this->Controls->Add(this->TextHello);
            this->Controls->Add(this->button1);
            this->Name = L"MyForm";
            this->Text = L"MyForm";
            this->ResumeLayout(false);
            this->PerformLayout();

        }
#pragma endregion
    private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) 
    {
        System::String^ l = Login->Text;
        System::String^ p = Login->Text;

        LoginT(l, p);
    }
    public: static void check(bool isLogin) {
        MyForm inter;
        inter.h();
    }
    public: void h() {
        TextHello->Text = "Error login";
        Sleep(5000);
        TextHello->Text = "Hello User!";


    }
    
};
}