fatal error LNK1169: one or more multiply defined symbols found

#pragma once
#include <windows.h>
#include <process.h>
#include "Form2.h"
#include "mediashop.h"
 
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
 
 
namespace Shop {
 
    /// <summary>
    /// Summary for Form3
    ///
    /// </summary>
    public ref class Form3 : public System::Windows::Forms::Form
    {
    public:
        Form3(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }
 
    protected:
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        ~Form3()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::MenuStrip^  menuStrip1;
    protected: 
    private: System::Windows::Forms::ToolStripMenuItem^  файлToolStripMenuItem;
    private: System::Windows::Forms::ToolStripMenuItem^  создатьToolStripMenuItem;
    private: System::Windows::Forms::ToolStripMenuItem^  открытьToolStripMenuItem;
    private: System::Windows::Forms::ToolStripMenuItem^  сохранитьToolStripMenuItem;
    private: System::Windows::Forms::ToolStripMenuItem^  сохранитьКакToolStripMenuItem;
    private: System::Windows::Forms::ToolStripSeparator^  toolStripSeparator1;
    private: System::Windows::Forms::ToolStripMenuItem^  выходToolStripMenuItem;
    private: System::Windows::Forms::ToolStripMenuItem^  редактироватьToolStripMenuItem;
 
    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)
        {
            // Инициализация компонентов формы...
        }
#pragma endregion
    private: System::Void Form3_Load(System::Object^  sender, System::EventArgs^  e) {
                 Form2 ^f2 = gcnew Form2();
                 f2->ShowDialog();
 
                 mediashop obj;
             }
    };
}

//
// Класс "Магазин"
//
class mediashop
{
    char *title;
public:
    mediashop();
};
 
mediashop::mediashop()
{
}

mediashop obj;