Question

How can I turn these two bits of code into one?

comCtrList = (from i in genOutList
                                  join f in genAccList
                                          on i.Contract equals f.Contract
                                  select i.Contract).ToList();

genOutList.RemoveAll(acc => comCtrList.Contains(acc.Contract));

Answer 1

Do you want something like this?

genOutList= (
                  from i in genOutList
                  where !genAccList.Any(x=>x.Contract==i.Contract)
                  select i
             ).ToList();

Or

genOutList.RemoveAll(x=>genAccList.Any(i=>i.Contract==x.Contract));