public UnitOfWork(ApplicationDbContext db)
{
_db = db;
Category = new CategoryRepository(_db);
CoverType = new CoverTypeRepository(_db);
Product = new ProductRepository(_db);
Company = new CompanyRepository(_db);
ApplicationUser = new ApplicationUserRepository(_db);
OrderHeader = new OrderHeaderRepository(_db);
OrderDetails = new OrderDetailsRepository(_db);
ShoppingCart = new ShoppingCartRepository(_db);
SP_Call = new SP_Call(_db);
}