There are several map view modes on Silverlight Bing Maps as 2D projection of the Earth. Road, Aerial or AerialWithLabels modes.

In Aerial with Label mode we are able to see landform and also roads, street names and place names on the map. 

we can define Aerial with Labels Map Mode in XAML code with "Mode" Property

<Microsoft_Maps_MapControl:Map Mode="Aerial" x:Name="MapIK" Center="41,29" ZoomLevel="10"/>

or define dynamicly in C#

In code side we can display Labels on AerialMode with boolean value in it.

MapIK.Mode = new AerialMode(true);


All the best