public DataRepository(string connection_string)
{
_connection_string = connection_string;
Brand = new BrandRepository(_connection_string);
Insurances = new InsuranceRepository(_connection_string);
Suppliers = new SupplierRepository(_connection_string);
ServiceOrders = new ServiceOrderRepository(_connection_string);
Products = new ProductsRepository(_connection_string);
ServiceOrdersStatus = new ServiceOrderStatusRepository(_connection_string);
//ServiceOrders
}