Subtract a generic list from another

Question

I am trying remove a list of firmIDs from one list from another. I don\'t really understand linq but I am pretty sure I need to use it.

List firm         


        

Answer 1

If you have list X and a list Y, and you want to remove all items in Y that are in X you can experiment with the following:

X.Intersect(Y)

Comparing two Lists and returning the distinct values and the differences