c# - Best way to send images between an Universal Application and a web service -

hi i'm making aplication takes picture car , driver , pictures send web service, having problems dealing situation, right i've tried send encoded 64 base string, not working

edit here code i'm using take picture , save byte array

 imageencodingproperties format = imageencodingproperties.createjpeg();          //rotate , save image         using (var imagestream = new inmemoryrandomaccessstream())         {             //generate stream mediacapture             await photocapture.capturephototostreamasync(format, imagestream);             await photocapture.stoppreviewasync();              //create decoder , encoder             bitmapdecoder dec = await bitmapdecoder.createasync(imagestream);             bitmapencoder enc = await bitmapencoder.createfortranscodingasync(imagestream, dec);              //roate image             enc.bitmaptransform.rotation = bitmaprotation.clockwise90degrees;              //write changes image stream             await enc.flushasync();             previewimage = new writeablebitmap(350, 500);             previewimage.setsource(imagestream);          }         captureelement.visibility = windows.ui.xaml.visibility.collapsed;         using (var ms = previewimage.pixelbuffer.asstream())         {             memorystream memorystream = new memorystream();             ms.copyto(memorystream);             drivermodel.picture = memorystream.toarray();         } 

when i'm doing array size 28 millions, obviusly i'm making wrong