Can't add layers from WMS Request in ArcGIS map

[NenkoPakov]

Hi, can somebody show me how to create Xamarin mobile app with map and to add on it two layers from this "http://anta.nat.bg:8080/cgi-bin/mapserv.exe?map=/ms4w/maps/map.map&SERVICE=WMS&VERSION=1.1.1&REQUEST..."
request.

I use the example in ArcGISRuntime Samples:

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private readonly Uri _wmsUrl = new Uri(
"http://anta.nat.bg:8080/fcgi-bin/mapserv.exe?map=/ms4w/maps/map.map&SERVICE=WMS&request=getcapabilities&service=WMS");

private readonly List<string> _wmsLayerNames = new List<string> { "bnd_lines" };

public MapPage()
{
InitializeComponent();

Initialize();
}

private void Initialize()
{
Map myMap = new Map(Basemap.CreateLightGrayCanvas())
   {
   InitialViewpoint = new Viewpoint(
   new Envelope(-19195297.778679, 512343.939994, -3620418.579987, 8658913.035426, 0.0, 0.0,    SpatialReferences.WebMercator))
   };

MyMapView.Map = myMap;

WmsLayer myWmsLayer = new WmsLayer(_wmsUrl, _wmsLayerNames);

myMap.OperationalLayers.Add(myWmsLayer);
}

---------------------------------------------------------------------

But nothing is showing on the map.

I am new in programming and can't do it for days.
Many thanks!