I know this might sound very stupid but can someone explain to me why the following code do not work? and maybe some tutorial for dummie on lambad: int test = 1; int testLambadIndex = rooms.FindIndex (r => (Room.LastCreatedRoomAt)r.lastCreatedRoomAt = (Room.LastCreatedRoomAt)test); i try to use this enum from Room class public enum LastCreatedRoomAt{North = 1,South,West,East,None}; rooms is a list of type Room.

What is the reason behind type casting in your expression. I you want to find index of specific record then you can do simply like this... List rooms = new List (); int test = 1; int testLambadIndex = rooms.FindIndex(r => r.ID == test);

Btw, i have the next error: Assets/_Scripts/RoomGenerator.cs(37,47): error CS0131: The left-hand side of an assignment must be a variable, a property or an indexer