public HttpResponseMessage getDetailsFromISBN(string ISBN)
{
List <BookDetails> list = new List <BookDetails>();
BookDetails u = new BookDetails();
list = u.getDetailsFromISBN(ISBN);
string yourJson = JsonConvert.SerializeObject(list);
var response = this.Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json");
return(response);
}