public Task UpdatePechatProduct(PechatProduct pechatproduct)
        {
            var foundPechatProduct = GetPechatProduct(pechatproduct.Id).Result;

            if (foundPechatProduct == null)
            {
                AddPechatProduct(pechatproduct);
            }
            else
            {
                if (foundPechatProduct != pechatproduct)
                {
                    _pechatproducts.Remove(foundPechatProduct);
                    _pechatproducts.Add(pechatproduct);
                }
            }
            return(Task.CompletedTask);
        }
 public Task RemovePechatProduct(PechatProduct pechatproduct)
 {
     _pechatproducts.Remove(pechatproduct);
     return(Task.CompletedTask);
 }
 public Task AddPechatProduct(PechatProduct pechatproduct)
 {
     _pechatproducts.Add(pechatproduct);
     return(Task.CompletedTask);
 }