Dynamic LINQ - Knowledge Base (KB)

What is the best way to make a dynamic linq to entities query?

Now this is probably really easy but being the tool that I am, I'm not sure the best way to attack this problem....I have a DAL and a load of methods using EF that populate drop down lists in a UI. i.e. material, source....From these, I want the user to ...

query using dynamic linq

I have query to perform where the user will enter at runtime one of the columns to be included in the result set. And, I won't know until runtime how many columns he could choose from (he uploads a file that can contain a varying number of columns). I'd l...