MS SQL Local DB deployment

Dear Expert,

This is my first question to this forum and poor in english.

I had made certain application with Back end MS SQL 2008 Express.

Few of My client needs to run the same application in their portable Drive (Ext. HDD).They have intention to work on on application in window PC or Laptop.

I came to know about MS sql local DB 2012 which has no installation issue and start its services as and when require.

But I m not finding the way how to run / deploy my application along with MS SQL local DB.

Please help.