Linq Queries

Question

Make a List<T> collection from two more List<T> collections using Linq Query instead of Foreach.

Ex : I have Two Collections like List<Registration> ,List<Patient>
Integration above Collection and make a List<ServiceDetails> Collection.
For this I am using Foreach and form the collection ,
But I need Linq Query to make the same scenario.

Can any one give me Idea on above Query?