Program:

The source code to find the sum of array elements using the predefine method is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

//C# program to demonstrate the 
//Except() method in Linq.

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

class Program
{
    static void Main(string[] args)
    {
        List<int> list1 = new List<int>();
        List<int> list2 = new List<int>();

        list1.Add(1);
        list1.Add(2);
        list1.Add(3);
        list1.Add(4);
        list1.Add(5);
        list1.Add(6);

        list2.Add(1);
        list2.Add(3);
        list2.Add(5);
        list2.Add(6);
        list2.Add(7);
        list2.Add(8);

        var query = (from num in list1
                    select num)
                    .Except(list2).ToList();

        foreach (var val in query)
        {
            Console.WriteLine(val);
        }
    }
}

Output:

2
4
Press any key to continue . . .

Explanation:

In the above program, we created two lists list1 and list2 using generic List collection. Then add the elements in lists using the Add() method.

var query = (from num in list1
        select num)
        .Except(list2).ToList();

Using the above code, we find those elements that are present in list1 but not present in list2 using the Linq query.

foreach (var val in query)
{
    Console.WriteLine(val);
}

Using the above code, we printed the query result on the console screen.