working with WCF 4.5 and EF 5.0

Problem:

• EF 5.0 using DBContext by defaults
• DBContext is not serializable, so can't be consumed over WCF 
• we can make the DBContext serializable by editing the T4 template of the entity framework which is alot of work and hacky
• we can use STE entities (self tracking entities)
• when sending the entity back you need to mark the entity as modified after attaching and before saving
• http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/c9a6eca8-3865-4c6b-adaa-9f22c98e09cb/