Find the Number of Occurrences of a Character in a String using C#

CODE

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please enter your string");
            string input = Convert.ToString(Console.ReadLine());
            Dictionary < string, int > objdict = new Dictionary < string, int > ();
            foreach(char j in input) {
                if (objdict.ContainsKey(j.ToString()))
                {
                    objdict[j.ToString()] = objdict[j.ToString()] + 1;
                } else {
                    objdict.Add(j.ToString(), 1);
                }
            }
            foreach(var temp in objdict)
            {
                Console.WriteLine("Key: {0}, Value: {1}", temp.Key, temp.Value);
            }
            Console.ReadLine();
        }
    }
}