#Select specified items from Tuple List
##Select one item to form list
`tupleList.Select(element => new string(element.Item1)).ToList();`
##Select one item to form list
Now, I have a three-Tuple List and I need to select the first and third item to form a new Tuple List.
`tupleList.Select(element => new Tuple<string, string>(element.Item1, element.Item3)).ToList();`