Hi there,
This is the SQL Server spatial forum - you'll probably get a better reply if you post to the Bing Maps forum - http://social.msdn.microsoft.com/Forums/en-US/vemapcontroldev/threads
The Bing Maps platform has several different components - it would be helpful if you could describe which one you are trying to use (e.g. are you trying to display the location of a postcode on a javascript map page? Are you using the Bing Maps web services to populate a geography/geometry column in a database based on a postcode? Are you using the silverlight control? Are you trying to update an entire table of postcode records with lat/long, in which case the MapPoint Web Service may be a better choice....)
Beginning Spatial with SQL Server
http://www.apress.com/book/view/1430218290