LINQ sum () Function

In LINQ sum() function is used to calculate the sum of the items in collections/lists.

Following is the syntax to define the LINQ sum function in C#, to sum up, the items on the list.

Syntax of the LINQ Sum function in C#

int[] Num = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int Sum = Num.Sum();

From the above syntax, we are summing up the items in the "Num" list using the LINQ Sum function.

Now, we will see the complete example of using the LINQ Sum () function to sum up the items from the collections/list in C# applications.

using System;
using System.Collections.Generic;
using System. Linq;
using System. Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {   
//create array num with the initializing value
            int[] Num = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
            Console.WriteLine("Calculating the sum of all the elements of the array :");
//Num.Sum() is used to add the value of the Num array
            int Sum = Num.Sum();
            Console.WriteLine("The Sum is {0}", Sum);
            Console.ReadLine();
        }
    }
}

In the above example, we used the sum function to calculate the sum of the elements in the array list "Num."

When we execute the above example, we get the result, as shown below: