How do I store an object in Session in Asp.net core Web api?

       //
      public class OrderVM
      {
       public User numUsu { get; set; } 
        //La lista es de ProductOrder
       public  List<ProductOrder> Products  {get; set;}

       }

        var orderView = new OrderVM();
        orderView.numUsu = new User();
        orderView.Products = new List<ProductOrder>();


              var productOrder = new ProductOrder
            {
                Code = prod,
                AplhaNumericCode = produ.AplhaNumericCode,
                Description = produ.Description,
                Name = produ.Name,
                WholesalePrice = produ.WholesalePrice,
                idProd=produ.idProd,
                quant = cant
            };

       orderView.Products.Add(productOrder);