abababa sub string, C#

Language: Layout:

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            var input ="abcdefgh";
            Console.WriteLine("Input: \"" + input +"\"");
            
            var inputLen = input.Length;
            var maxProd = 0;
            var subStrLen= 1; //always start with first char
            
            while (subStrLen <= inputLen)
            {
                var occurance =0; 
                var curProd = 0;
                var findStr = input.Substring(curProd, subStrLen) ;
                for(int i=0; i < inputLen - subStrLen +1; i++)
                {
                    if(findStr == input.Substring(i, subStrLen))
                    {
                        occurance++;
                    }
                }
                curProd = subStrLen * occurance;
                if(maxProd <= curProd)
                {
                    maxProd = curProd;
                }
                
                Console.WriteLine(string.Format("\"{0}\", whose product equals {1} * {2} = {3},",findStr,subStrLen,occurance,curProd ));
                
                subStrLen ++;
            }
            Console.WriteLine("Output: " + maxProd);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,19 sec, absolute running time: 0,13 sec, cpu time: 0,12 sec, average memory usage: 16 Mb, average nr of threads: 3, absolute service time: 0,34 sec