Credentials are Either Invalid or Unspecified

I am using bing Maps in my app. When i am using the Get Directions it's showing this error. How to solve it. I googled for hours but hasn't got any help. Pleas help.

These are the two services which i am hitting.

http:/开发者_开发百科/dev.virtualearth.net/webservices/v1/routeservice/routeservice.svc/mex http://dev.virtualearth.net/webservices/v1/geocodeservice/geocodeservice.svc/mex

Or Please give me Step by Step Procedure to work with the bing maps.

Check the Bing Map Sample application given in MSDN .It has code which shows how to implement Bing Map.Hope this helps

The error you are getting is often due to missing or incorrect credentials. You need to have an API key to access the Bing Maps services. This blog post includes a description of how to get a key and set it in your project.