C#: Find the sum of all elements of array

using System;  // Importing necessary namespace

public class Exercise3  // Declaration of the Exercise3 class
{  
    public static void Main()  // Main method, entry point of the program
    {
        int[] a = new int[100];  // Declaration of an integer array 'a' with size 100
        int i, n, sum = 0;  // Declaration of variables 'i', 'n', and 'sum' and initializing 'sum' as 0
		
        // Display a message about finding the sum of all elements of an array
        Console.Write("\n\nFind sum of all elements of array:\n");
        Console.Write("--------------------------------------\n");

        // Prompt the user to input the number of elements to be stored in the array
        Console.Write("Input the number of elements to be stored in the array: ");
        n = Convert.ToInt32(Console.ReadLine());  // Read the number of elements from the user and store it in 'n'

        Console.Write("Input {0} elements in the array:\n", n);  // Prompt the user to input 'n' elements

        // Loop to read 'n' elements from the user and store them in the array 'a'
        for (i = 0; i < n; i++)
        {
            Console.Write("element - {0} : ", i);  // Prompt for input element number
            a[i] = Convert.ToInt32(Console.ReadLine());  // Read user input and store it in the array 'a'
        }

        // Loop to calculate the sum of all elements stored in the array 'a'
        for (i = 0; i < n; i++)
        {
            sum += a[i];  // Calculate the sum by adding each element of the array 'a' to 'sum'
        }

        // Display the sum of all elements stored in the array 'a'
        Console.Write("Sum of all elements stored in the array is : {0}\n\n", sum);
    }
}