Find the Count of Repetitive Number using Dictionary

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharpGitHubPgm
{
    class Program
    {
        static void Main(string[] args)
        {

            int[] arr = { 1, 2, 3, 1, 5, 2, 1 };
            Dictionary<int, int> storeRepeatedNumber = new Dictionary<int, int>();
            Console.WriteLine("To find the repeatative element in the array");
            for (int i = 0; i < arr.Length; i++)
            {
                if (storeRepeatedNumber.ContainsKey(arr[i]))
                {
                    int previousValue = storeRepeatedNumber[arr[i]];
                    storeRepeatedNumber[arr[i]] = previousValue + 1;
                }
                else
                {
                    storeRepeatedNumber.Add(arr[i], 1);
                }
            }
            foreach (KeyValuePair<int,int> item in storeRepeatedNumber)
            {
                Console.WriteLine("{0} Occurs {1} times", item.Key,item.Value);
            }
            Console.ReadLine();
        }
    }
}