get only unique values from list c# code example

Example 1: unique items in list c#

var uniqueItemsList = yourList.Distinct().ToList();

Example 2: get unique array based on value in c#

items.Distinct<int>()

Example 3: c# list with only unique items

If your requirements are to have no duplicates, you should be using a HashSet.
HashSet.Add will return false when the item already exists (if that even matters to you).