Find Maximal Increasing Sequence In Array

using System;

namespace MaxIncreasingSequence
{
    class MaxIncreasingSequence
    {
        static void Main()
        {
            Console.WriteLine("Please enter length for the array:");
            int n = int.Parse(Console.ReadLine());
            int start = 0;
            int len = 1;
            int bestLen = 0;
            string num = "";
            string maxIncSeq = "";
            int[] numbers = new int[n];
            int length = numbers.Length;

            for (int i = 0; i < length; i++)
            {
                Console.Write("Enter {0} number: ", i + 1);
                numbers[i] = int.Parse(Console.ReadLine());
            }

            for (int i = 1; i < length; i++)
            {
                if (numbers[i] - numbers[i - 1] == 1)
                {
                    start++;
                    if (start == len)
                    {
                        num += numbers[i - 1];
                        num += numbers[i];
                    }
                    if (start > len)
                    {
                        len = start;
                        num += numbers[i];
                    }
                    if (len > bestLen)
                    {
                        bestLen = len;
                        maxIncSeq = num;
                    }
                }
                else
                {
                    num = "";
                    start = 0;
                    len = 1;
                }
            }
            Console.WriteLine("Max increasing sequence: {0}", maxIncSeq);
        }
    }
}