How to write linq query for select ID from list of list?

Question

How to write linq query for select ID from list of list? I have following List: SearchingDataList,in this list again contains another list that is called SearchDataList and in this list contains an ID field.

How do i Select that particular ID while I select selectedItem from a ListBox?

The structure is like this:

SearchingDataList.SearchDataList.ID

Answer 1

var result = OuterList.Where(t=>t.InnerList.Any(s=>s.Id == yourID));

Answer 2

Your question is not very clear.

This way you get a list of all ids in the the nested list.

searchindDataLists.SelectMany(x => x.searchDataList).Select(x => x.Id)