After Adding Bing Maps Control in Silverlight application it requires a Bing Maps Key for using it and this requirement message appears on center of the map.


To get a Bing Maps Key; you need create a Bing Maps Developer Account from Bing Maps Portal and generate a key with your account at https://www.bingmapsportal.com.


Taking a key requires your application name and application url, after clicking "Create Key" you can get a key. Now we can use this key in our silverlight application with in CredentialsProvider="Your Key is here" property.

All the Best.