c# - Uploading a photo to the vk.com api server -


i'm trying upload image server of vk.com, in result of request - empty "photo":"[]";

{"server":627329, "photo":"[]","hash":"6ce9e707ba60a464bc45070a748dc9ec "}

my code is:

private static httpwebresponse postmethod()     {      //getting json url upload.     string url = "https://api.vk.com/method/photos.getmessagesuploadserver?&v=5.31&access_token=247878418f7f0ab793cd40e1434af3f51794ec09e85";     webclient client = new webclient();     string json = client.downloadstring(url);     javascriptserializer json_serializer = new javascriptserializer();      //getting image uploading later.     byte[] imagedata = client.downloaddata("http://cs5530.vk.me/u43529379/-6/m_b9515ce2.jpg");     rootobject response = (rootobject)json_serializer.deserialize(json, typeof(rootobject));      //geting out url uploading, response.     httpwebrequest request = (httpwebrequest)webrequest.create(response.response.upload_url);     request.method = "post";     request.credentials = credentialcache.defaultcredentials;      utf8encoding encoding = new utf8encoding();      var bytes = encoding.getbytes(imagedata.tostring());      request.contenttype = "application/json";     request.contentlength = bytes.length;      using (var newstream = request.getrequeststream())     {       newstream.write(bytes, 0, bytes.length);       newstream.close();     }       return (httpwebresponse)request.getresponse();     }

any advice appreciated. thank you.

after seeing documentation posted

httpwebrequest request = (httpwebrequest)webrequest.create(response.response.upload_url); request.method = "post"; request.credentials = credentialcache.defaultcredentials; request.transferencoding = "utf8";  utf8encoding encoding = new utf8encoding();  string encoded = convert.tobase64string(imagedata); string postdata = "photo=" + encoded;  request.contenttype = "multipart/form-data"; request.contentlength = encoding.utf8.getbytecount(postdata);  using (var newstream = request.getrequeststream()) {     byte[] postbytes = encoding.utf8.getbytes(postdata);     newstream.write(postbytes, 0, postbytes.length);     newstream.close(); } return (httpwebresponse)request.getresponse();

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