How to compare two lists and add the difference to a third list in C#?

First, set up two lists -

list one

List < string > list1 = new List < string > ();
list1.Add("A");
list1.Add("B");
list1.Add("C");
list1.Add("D");

list two

List < string > list2 = new List < string > ();
list2.Add("C");
list2.Add("D");

find between the two lists and display the difference elements -

IEnumerable < string > list3;
list3 = list1.Except(list2);
foreach(string value in list3) {
   Console.WriteLine(value);
}

Here is a complete example of comparing two lists-

Example

using System;
using System.Collections.Generic;
using System.Linq;

public class Demo {
   public static void Main() {
      List < string > list1 = new List < string > ();
      list1.Add("A");
      list1.Add("B");
      list1.Add("C");
      list1.Add("D");

      Console.WriteLine("First list...");
      foreach(string value in list1) {
         Console.WriteLine(value);
      }

      Console.WriteLine("Second list...");
      List < string > list2 = new List < string > ();

      list2.Add("C");
      list2.Add("D");
      foreach(string value in list2) {
         Console.WriteLine(value);
      }

      Console.WriteLine("Difference in the two lists...");
      IEnumerable < string > list3;
      list3 = list1.Except(list2);
      foreach(string value in list3) {
         Console.WriteLine(value);
      }
   }
}

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