.net - C# Update List by adding new items, updating existing items and deleting uncommon items in least iteration -

i need update existing list data of new list. shown below:

i have list binded ui element. need update items data of list items of list b without assigning list list b. shown below:

list a: { {id: 1, value: aaa}, {id: 2, value: ddd}, {id: 3, value: ccc}, {id: 4, value: bbb} }  list b: { {id: 1, value: zzz}, {id: 5, value: xxx}, {id: 3, value: yyy}, {id: 4, value: bbb} }  after updation should have value in list below:  list a: { {id: 1, value: zzz}, {id: 5, value: xxx}, {id: 3, value: yyy}, {id: 4, value: bbb} } 

what best way achieve this?

this should it:

a.removeall(aitem => b.all(bitem => aitem.id != bitem.id)); a.foreach((aitem) => { aitem.value = b.first(bitem => aitem.id == bitem.id).value; }); a.addrange(b.where(bitem => a.all(aitem => aitem.id != bitem.id))); 

row #1 deletes uncommon items. row #2 updates common items between thetwo lists. , row #3 adds b-unique items.