private static void AddCustomer(Customer customer)
 {
     if (!customers.TryAdd(customer.Id, customer))
     {
         HttpResponseMessage response = new HttpResponseMessage();
         response.StatusCode = HttpStatusCode.Conflict;
         response.Content = new StringContent(string.Format("There already a customer with id '{0}'.", customer.Id));
         throw new HttpResponseMessageException(response);
     }
 }
 private static HttpResponseMessage GetResponseForCustomer(Customer customer)
 {
     return new HttpResponseMessage()
     {
         StatusCode = HttpStatusCode.OK,
         Content = new StringContent(SerializeCustomer(customer))
     };
 }
 private static string SerializeCustomer(Customer customer)
 {
     return string.Format("Id = {0}; Name = {1}", customer.Id, customer.Name);
 }
        private static Customer GetCustomerFromRequest(HttpRequestMessage request)
        {
            if (request.Content == null)
            {
                HttpResponseMessage noContentResponse = new HttpResponseMessage();
                noContentResponse.StatusCode = HttpStatusCode.BadRequest;
                noContentResponse.Content = new StringContent("Expected an entity body with customer data but no content was found.");
                throw new HttpResponseMessageException(noContentResponse);
            }

            string content = request.Content.ReadAsString();
            string[] contentSplit = content.Split('=', ';');

            if (contentSplit.Length == 4)
            {
                if (string.Equals(contentSplit[0].Trim(), "Id", StringComparison.OrdinalIgnoreCase) &&
                    string.Equals(contentSplit[2].Trim(), "Name", StringComparison.OrdinalIgnoreCase))
                {
                    Customer customer = new Customer();
                    int id;
                    if (int.TryParse(contentSplit[1].Trim(), out id))
                    {
                        customer.Id = id;
                        customer.Name = contentSplit[3].Trim();
                        return customer;
                    }
                }
            }

            HttpResponseMessage faileParseResponse = new HttpResponseMessage();
            faileParseResponse.StatusCode = HttpStatusCode.BadRequest;
            faileParseResponse.Content = new StringContent("Parsing the entity body as a customer failed.");
            throw new HttpResponseMessageException(faileParseResponse);
        }