Редици.04.01.Most frequent number in int array

using System;
using System.Collections.Generic;
class MostFrequentNumber
{
    static void Main()
    {
        int[] arr = { 1, 1, 55, 55, 1,55,55 };
        List<int> list = new List<int>();

        int appearance = 1;
        int bestAppearance = 0;
        int value = 0;
        for (int i = 0; i < arr.Length; i++)
        {
            if (list.Contains(arr[i]))
            {
                continue;
            }
            for (int j = i + 1; j < arr.Length; j++)
            {
                if (arr[i] == arr[j])
                {
                    appearance++;
                    if (appearance > bestAppearance)
                    {
                        bestAppearance = appearance;
                        value = arr[i];
                    }
                }
            }
            //if (appearance > bestAppearance)
            //{
            //    bestAppearance = appearance;
            //    value = arr[i];
            //}
            appearance = 1;
            list.Add(arr[i]);  //добавям ги в листа и проверявам за да не се повтаря търсенето
        }
        Console.Write("Best times -> " + bestAppearance);//4
        Console.WriteLine(" Value -> " + value);//5
        Console.WriteLine();
    }
}