how can I do use Except() between two SelectListItem lists [closed]

Answer 1

Maybe something like:

var items1 = new List();
var items2 = new List();
//[.. populate lists here ..]
var onlyInFirst = items1.RemoveAll(item1 => items2.Any(item2 => item1.Value == item2.Value));

Except requires that Equals and GetHashCode is implemented in the traversed class.