private async void Initialize()
{
// Create new Map with basemap
Map myMap = new Map(Basemap.CreateTopographic());
// Create and set initial map area
Envelope initialLocation = new Envelope(
-229835, 6550763, -222560, 6552021,
SpatialReferences.WebMercator);
myMap.InitialViewpoint = new Viewpoint(initialLocation);
// Assign the map to the MapView
_myMapView.Map = myMap;
// Create overlay to where graphics are shown
GraphicsOverlay overlay = new GraphicsOverlay();
// Add created overlay to the MapView
_myMapView.GraphicsOverlays.Add(overlay);
// Add graphics using different source types
await CreatePictureMarkerSymbolFromUrl(overlay);
await CreatePictureMarkerSymbolFromResources(overlay);
}