Firstly, create lists −
//three lists var list1 = new List{3, 4, 5}; var list2 = new List{1, 2, 3, 4, 5}; var list3 = new List{5, 6, 7, 8};
Use the union method to get the union of list1 and list2 −
var res1 = list1.Union(list2); var res2 = res1.Union(list3);
The following is the complete code −
using System.Collections.Generic; using System.Linq; using System; public class Demo { public static void Main() { //three lists var list1 = new List<int>{3, 4, 5}; var list2 = new List<int>{1, 2, 3, 4, 5}; var list3 = new List<int>{5, 6, 7, 8}; // finding union var res1 = list1.Union(list2); var res2 = res1.Union(list3); foreach(int i in res2) { Console.WriteLine(i); } } }
3 4 5 1 2 6 7 8