public void Delete(int productId, int manufacturerId)
        {
            Product_Manufacturer_Mapping m = GetProduct_Manufacturer_Mapping(productId, manufacturerId);

            if (m != null)
            {
                db.Product_Manufacturer_Mapping.Remove(m);
            }
        }
 public void Update(Product_Manufacturer_Mapping item)
 {
     db.Entry(item).State = EntityState.Modified;
 }
 public void Create(Product_Manufacturer_Mapping item)
 {
     db.Product_Manufacturer_Mapping.Add(item);
 }