Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability.
using System; class Program { static void Main() { int[] arr = new int[100]; int i, num, sum = 0; ////Reads size and elements in array Console.WriteLine("Enter size of the array: "); num = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("Enter "+num+" elements in the array: "); for(i=0; i<num; i++) { arr[i] = Convert.ToInt32(Console.ReadLine()); } //Adding all elements for(i=0; i<num; i++) { sum = sum + arr[i]; // Calculating sum } Console.WriteLine("Sum of all elements of array: "+sum); Console.ReadLine(); } }