private void button1_Click(object sender, EventArgs e)
        {
            Administration admin = new Administration();

            admin.Login       = tb_login.Text;
            admin.Password    = tb_password.Text;
            admin.FullName    = tb_fullName.Text;
            admin.YearOfBirth = tb_yearOfBirth.Text;
            admin.Position    = tb_position.Text;
            admin.Salary      = tb_salary.Text;

            ExcelService excel = new ExcelService();
            string       path  = Environment.GetFolderPath(Environment.SpecialFolder.Personal) + "\\Information System For Car Service\\Information System.xls";

            excel.OpenDocument(path);
            excel.WriteDataAdministration(admin);
            excel.CloseDocument();

            this.Close();
        }