How to pass customer object to web api action

i am trying to perform crud operation by web api. so i pass customer json from client to web api action.

this is my json which i passed from client to action.

{"CustomerID":"James","CompanyName":"jame pvt","ContactName":"James","ContactTitle":"Sr Developer","Address":"Salt lake","Region":"sect-1","PostalCode":"700009","City":"kolinara","Country":"India","Phone":"033-8547-4789","Fax":"033-8547-4781"}

my web api action looks as below

[RoutePrefix("api/customer")]publicclassCustomerController:ApiController{[HttpPost,Route("AddCustomer")]publicHttpResponseMessagePostCustomer(Customer customer){
                customer = repository.Add(customer);var response =Request.CreateResponse<Customer>(HttpStatusCode.Created, customer);
                response.ReasonPhrase="Customer successfully added";string uri =Url.Link("DefaultApi",new{ customerID = customer.CustomerID});
                response.Headers.Location=newUri(uri);return response;}}

this way i try to call action from httpclient from winform apps

private async void btnAdd_Click(object sender,EventArgs e){Customer oCustomer =newCustomer{CustomerID="James",CompanyName="James pvt",ContactName="James",ContactTitle="Sr Developer",Address="Salt lake",Region="sect-1",PostalCode="700009",City="Kolinara",Country="India",Phone="033-8547-4789",Fax="033-8547-4781"};var fullAddress ="http://localhost:38762/api/customer/AddCustomer";try{
                using (var client =newHttpClient()){var serializedCustomer =JsonConvert.SerializeObject(oCustomer);var content =newStringContent(serializedCustomer,Encoding.UTF8,"application/json");

                    using (var response = client.PostAsync(fullAddress, content).Result){if(response.IsSuccessStatusCode){var customerJsonString = await response.Content.ReadAsStringAsync();//_Customer = JsonConvert.DeserializeObject<IEnumerable<Customer>>(customerJsonString);}else{Console.WriteLine("{0} ({1})",(int)response.StatusCode, response.ReasonPhrase);var dict =JsonConvert.DeserializeObject<Dictionary<string,string>>(response.Content.ReadAsStringAsync().Result);MessageBox.Show(dict["Message"]);}}}}catch(HttpRequestException ex){// catch any exception here}}

this is the error message i got when i do the same from fiddler. the error msg is :

{"Message":"The request contains an entity body but no Content-Type header. The inferred media type 'application/octet-stream' is not supported for this resource.","ExceptionMessage":"No MediaTypeFormatter is available to read an object of type 'Customer' from content with media type 'application/octet-stream'.","ExceptionType":"System.Net.Http.UnsupportedMediaTypeException","StackTrace":" at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable

1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable

1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"}

now please tell me what is wrong in my code for which i am getting error.

thanks