asp.net web api - Error on data posting in xamarin.forms -

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getting error while posting data sql using .net web api in xamarin.forms 

statuscode: 204, reasonphrase: 'no content', version: 1.1, content: system.net.http.streamcontent, headers:{cache-control: no-cache pragma: no-cache server: microsoft-iis/8.5 x-aspnet-version: 4.0.30319 x-powered-by: asp.net access-control-allow-headers: content-type access-control-allow-methods: get, post, put, delete, options date: thu, 17 mar 2016 08:32:28 gmt expires: -1 }}

this code post data 

 t returnresult = default(t);         httpclient client = null;         try         {             client = new httpclient();             client.baseaddress = new uri(hostname);             client.defaultrequestheaders.add("accept", "application/json");             client.timeout = new timespan(0, 0, 15);             httpresponsemessage result = null;             stringcontent data = null;             if (content != null)                 //     data = new stringcontent(jsonconvert.serializeobject(content), utf8encoding.utf8, "application/json");                 data = new stringcontent(jsonconvert.serializeobject(content), encoding.utf8, "application/json");             if (method == httpmethod.get)                 result = await client.getasync(endpoint);             if (method == httpmethod.put)                 result = await client.putasync(endpoint, data);             if (method == httpmethod.delete)                 result = await client.deleteasync(endpoint);             if (method == httpmethod.post)                 result = await client.postasync(endpoint, data);             if (result != null)             {                 if (result.issuccessstatuscode                                    && result.statuscode == system.net.httpstatuscode.ok)                 {                     var json = result.content.readasstringasync().result;                     returnresult = jsonconvert.deserializeobject<t>(json);                 }             }

where should problem ?. api working fine , enabled cors

here example of how using postasync in code, think error 'no content' referring on not sending server maybe? hope example helps: 

public async task<bool> postappointmet(appointmententity anappointment) {     try{         httpclient client = new httpclient();         client.defaultrequestheaders.add("authorization", "bearer " + app.apitoken);          const string resourceuri = apibaseaddress + "/citas";          string postbody = jsonconvert.serializeobject(anappointment);          client.defaultrequestheaders.accept.add(new mediatypewithqualityheadervalue("application/json"));          httpresponsemessage response = await client.postasync (resourceuri, new stringcontent (postbody, encoding.utf8, "application/json"));          if (response.issuccessstatuscode) {             return true;         }          return false;     }     catch{         return false;     } }

where appointmententity model:

public class appointmententity {     public int doctor { get; set; }     public patiententity paciente { get; set; }     public dateentity cita { get; set; }... }

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