Sample Code

public class PushFulfilmentOrders : IHttpHandler
{
    public class Order
    {
        public Int32 OrderStatusId { get; set; }

        public String MRMOrderID { get; set; }
        public DateTime? PushedToFulfilmentDate { get; set; }

        public string DeliveryAddressLine1 { get; set; }
        public string DeliveryAddressLine2 { get; set; }
        public string DeliveryAddressLine3 { get; set; }
        public string DeliveryTown { get; set; }
        public string DeliveryCounty { get; set; }
        public string DeliveryPostcode { get; set; }
        public string DeliveryCountry { get; set; }

        public String BillingTitle { get; set; }
        public String BillingFirstName { get; set; }
        public String BillingLastName { get; set; }
        public string BillingAddressLine1 { get; set; }
        public string BillingAddressLine2 { get; set; }
        public string BillingAddressLine3 { get; set; }
        public string BillingTown { get; set; }
        public string BillingCounty { get; set; }
        public string BillingPostcode { get; set; }
        public string BillingCountry { get; set; }

        [JsonIgnore]
        public String FulfilmentSystemErrorMessage { get; set; }
        [NotMapped]
        public ICollection<OrderLineDTO> OrderLinesDTO { get; set; }
    }

    public class OrderLineDTO
    {
        public String ProductCode { get; set; }
        public Decimal UnitPrice { get; set; }
        public Int32 Quantity { get; set; }
        
        public OrderLineDTO(){
        }
    }

    public void ProcessRequest(HttpContext context)
    {
        int intCountSuccessfulPlacedIntoFulfillment = 0;
        int intCountErroredWhenPlacingIntoFulfillment = 0;
        int intCountConnectionErroredWhenPlacingIntoFulfillment = 0;
        StringBuilder sbConnectionErrors = new StringBuilder();

        using (DatabaseContext _db = new Database.Models.DatabaseContext())
        {
		//get all orders that are status 'ReadyForFulfilment'
		List&lt;Order&gt; PaidOrders = _db.Orders.Where(w => w.OrderStatusId == (int)OrderStatus.ReadyForFulfilment && w.MRMOrderID == null).ToList&lt;Order&gt;();
		foreach (Order order in PaidOrders)
		{
    		String MRMOrderNo = "0";
    		String strPromoCode = WebConfigurationManager.AppSettings["MRM.Promotion"];

    		//check the town field of the delivery details
    		String strTown = order.DeliveryTown;
    		if (String.IsNullOrWhiteSpace(strTown))
    		{
        		strTown = order.DeliveryCounty;
        		if (String.IsNullOrWhiteSpace(strTown))
        		{
					strTown = order.DeliveryAddressLine3;
					if (String.IsNullOrWhiteSpace(strTown))
					{
						strTown = order.DeliveryAddressLine2;
						if (String.IsNullOrWhiteSpace(strTown))
    					{
        					strTown = order.DeliveryAddressLine1;
    					}
					}
				}
    		}
    		order.DeliveryTown = strTown;

    		//if no billing details are captured, pass through the delivery details
    		order.BillingTitle = order.DeliveryTitle;
    		order.BillingFirstName = order.DeliveryFirstName;
    		order.BillingLastName = order.DeliveryLastName;
    		order.BillingAddressLine1 = order.DeliveryAddressLine1;
    		order.BillingAddressLine2 = order.DeliveryAddressLine2;
    		order.BillingAddressLine3 = order.DeliveryAddressLine3;
    		order.BillingTown = order.DeliveryTown;
    		order.BillingCounty = order.DeliveryCounty;
    		order.BillingPostcode = order.DeliveryPostcode;
    		order.BillingCountry = order.DeliveryCountry;

    		String strJSONResponse = String.Empty;
    		Boolean blnErrorOccured = false;

    		foreach (OrderLine _orderLine in order.OrderLines)
    		{
        		OrderLineDTO _orderLineDTO = new OrderLineDTO();
        		if (_orderLine.ProductVariantOptionId.HasValue)
        		{
					//variant product
					_orderLineDTO.ProductCode =  _orderLine.ProductVariantOption.FulfilmentCatalogueCode;
					_orderLineDTO.UnitPrice = _orderLine.ProductVariantOption.Price;
        		}
        		else
        		{
					//non variant product
					_orderLineDTO.ProductCode = _orderLine.Product.FulfilmentCatalogueCode;
					_orderLineDTO.UnitPrice = _orderLine.Product.Price;
        		}
        		_orderLineDTO.Quantity = _orderLine.Quantity;
        		order.OrderLinesDTO.Add(_orderLineDTO);
    		}
        
    		//upload order
    		using (WebClient client = new WebClient())
    		{
        		try
        		{
					byte[] response = client.UploadValues(WebConfigurationManager.AppSettings["Newton.UploadOrder.URL"], new NameValueCollection()
					{
    					{ "ApiKey", WebConfigurationManager.AppSettings["Newton.API.Key"] },
    					{ "OrderRecord", JsonConvert.SerializeObject(order) },
    					{ "PromoCode", strPromoCode }
					});
					strJSONResponse = Encoding.UTF8.GetString(response, 0, response.Length);
        		}
        		catch (Exception ex)
        		{
					strJSONResponse = ex.Message;
					blnErrorOccured = true;
        		}
    		}
        
    		if (strJSONResponse.Contains("{\"Error"))
				blnErrorOccured = true;
			
    		if (String.IsNullOrWhiteSpace(strJSONResponse))
				blnErrorOccured = true;

    		if (!blnErrorOccured)
    		{
        		JObject response = JObject.Parse(strJSONResponse);

        		double parsedOrderNo;
        		if (Double.TryParse((string)response["ORDERNO"], out parsedOrderNo))
        		{
					intCountSuccessfulPlacedIntoFulfillment += 1;

					order.MRMOrderID = (string)response["ORDERNO"];
					order.OrderStatusId = (int)OrderStatus.SentForFulfilment;
					order.PushedToFulfilmentDate = DateTime.UtcNow;
					_db.SaveChanges();
        		}
        		else
        		{
					// failed to push to fulfilment system for some reason
					intCountErroredWhenPlacingIntoFulfillment += 1;

					order.OrderStatusId = (int)OrderStatus.FailedToPushToFulfilment;

					if (!String.IsNullOrWhiteSpace((string)response["Error"]))
						order.FulfilmentSystemErrorMessage = (string)response["Error"];
					else
						order.FulfilmentSystemErrorMessage = "Blank response from Newton.";
				
					_db.SaveChanges();
        		}
    		}
    		else 
			{
				// failed to push to fulfilment system for some reason
				intCountErroredWhenPlacingIntoFulfillment += 1;

				order.OrderStatusId = (int)OrderStatus.FailedToPushToFulfilment;
				order.FulfilmentSystemErrorMessage = strJSONResponse;
				_db.SaveChanges();
    		}        
        }

        context.Response.ContentType = "text/plain";
        if (intCountSuccessfulPlacedIntoFulfillment &gt; 0)
			context.Response.Write(String.Format("Successfully placed: {0} orders into fulfilment system. ", intCountSuccessfulPlacedIntoFulfillment));
        
        if (intCountErroredWhenPlacingIntoFulfillment &gt; 0 || intCountConnectionErroredWhenPlacingIntoFulfillment &gt; 0)
			context.Response.Write(String.Format("{0} order(s) errored when placing them into fulfilment, their order status ID has been changed to 5 = (FailedToPushToFulfilment).", intCountErroredWhenPlacingIntoFulfillment));

        if (intCountSuccessfulPlacedIntoFulfillment == 0 && intCountErroredWhenPlacingIntoFulfillment == 0)
			context.Response.Write("No orders to process.");
    }
}