Count Number of Occurrences of a Character in a String using LINQ

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SchoolDays
{
    class Program
    {
        static void Main(string[] args)
        {
            string InputString = "aaabbbdsdbnkaaa sdf sdf ftgh ";
            string Result;
            var common = InputString.Intersect(InputString);
            for (int index = 0; index < common.Count(); index++)
            {
                int TotalStrOccurences = InputString.Count(f => f == common.ElementAt(index));
                Result = (common.ElementAt(index).ToString() != " ") ? common.ElementAt(index).ToString() : "Empty Space";
                Console.WriteLine(Result + " : " + TotalStrOccurences);
            }
            Console.ReadKey();
        }
    }
}