how to get index of latest element among duplicate items from array in c#?

Hi ravikhoda,

Good Problem to use LINQ:

Here is a Little sample program

using System;
using System.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] aNumbers = { 1, 1, 2, 2, 3, 4, 5, 6, 6, 7 };

            var indices = from number in aNumbers.Distinct()
                             select aNumbers.ToList().LastIndexOf(number);
            int[] aIndices = indices.ToArray();

            foreach (int iIndex in aIndices)
                Console.WriteLine(iIndex);

            Console.ReadKey();
        }
    }
}

The idea is to select only the distinct values from the original array. Then we call LastIndexOf for every distinct number on the original array. By this expression we build a IEnumerable of our indices. This is converted to your desired array of integers output-type (would not be needed just for enumerating like in the above sample).

Hope this helps

Kind regards Johannes