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Difference between two lists in C#

To get difference between 2 lists in C#, you can use Except() and Concat() methods by doing below steps:

1) Find values in first list that does not exist in second list using except method which returns a new list.
2) Find values in second list that does not exist in fist list using except method which returns a new list.
3) Concatenate the two lists results from step 1 and step 2 using Concat() method.

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

public class Program
{
	public static void Main()
	{
		List<int> list1 = new List<int> { 1, 2, 3, 4, 5};
		List<int> list2 = new List<int> { 3, 4, 5, 6, 7 };

		var valuesInList1 = list1.Except(list2);
		Console.WriteLine("Values In List1: " + string.Join(", ", valuesInList1));
		
		var valuesInList2 = list2.Except(list1);
		Console.WriteLine("Values In List2: " + string.Join(", ", valuesInList2));
		
		var valuesInBothLists = valuesInList1.Concat(valuesInList2).ToList();
		Console.WriteLine("Difference In Both Lists: " + string.Join(", ", valuesInBothLists));
	}
}

Output

Values In List1: 1, 2
Values In List2: 6, 7
Difference In Both Lists: 1, 2, 6, 7

Conclusion

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