Perfect Number Checker

Console.Title = "Perfect Number Checker";
            int n, i, sum;

            Console.Write("Check if a given number is perfect number or not:\n");
            Console.Write("-------------------------------------------------");
            Console.Write("\n\n");

            Console.Write("Input the  number : ");
            n = Convert.ToInt32(Console.ReadLine());
            sum = 0;

            for (i = 1; i < n; i++)
            {
                if (n % i == 0)
                {
                    sum += i;

                }
            }

            if (sum == n)
                Console.Write("\n... the number is perfect.");
            else
                Console.Write("\n... the number is not perfect.");
            Console.Write("\n");
            Console.ReadKey();