public HttpResponseMessage updateBookDetails(BookDetails bookDetails)
{
ReturnData rd = new ReturnData();
rd = bookDetails.updateBookDetails();
string yourJson = JsonConvert.SerializeObject(rd);;
var response = this.Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json");
return(response);
}