Silverlight as a Front-end. What is the possible options for Back-end technology?

I want to create a web-portal (for managing hotel tasks), which should be accessible from the local network. As a Front-end technology I chose the Silverlight. On the back-end a some DBMS should be running and probably Entity Framework will be used. The question is, what are possible reasonable types of back-end application开发者_JAVA技巧 and how it would be reasonable to connect it with a client Silverlight application? Just don't want to create a bike, if there are any more or less standard designs.

One of the most common options would be WCF RIA Services