реализация класса List

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

namespace lab03
{
    class A
    {
        int data;
        public A(int data )
        {
            this.data = data;
        }
        public override string ToString()
        {
            return data.ToString();
        }

    }
    class  list
    {

        private object[] arr;
        public int count { get; private set; }
        public int capacity { get; private set; }
        public list()
        {
            arr = new object[0];
        }

        public list (object item)
        {
            arr = new object[4];
            arr[0] = item;
            count = 1;
            capacity = 4;
        }

        public void Add(object item)
        {

            if ((count < capacity))
                if (count == 1)
                arr[count-1] = item;
            else
            {
                capacity += 4;
                object[] temp = new object[capacity];
                Array.Copy(arr, temp, arr.Length);
                temp[count] = item;
                arr = new object[capacity];
                Array.Copy(temp, arr, temp.Length);
             }
            count++;

        }

        public void Print()
        {
            for (int i =0; i < arr.Length;++i) if (arr[i] != null) Console.WriteLine("arr[{0}]={1}",i,arr[i]);
        }

        public void PrintPropertys()
        {
            Console.WriteLine("count = {0}       capacity={1}", count, capacity);
        }
        public override string ToString()
        {
            string res = "";
            foreach (var n in arr) { res = res + n + "\n"; }
            return res;
        }
        public void Clear()
        {
            for (int i = 0; i <= count; ++i) arr[i] = null;
                count = 0;
        }
        public bool Contains (object item)
        {
            foreach (var n in arr) if ((n != null) && (item == n)) return true;
            return false;
        }
    public bool Remove(object item)
        {


                for (int i = 0;i < count; ++i)
                {
                    if ((arr[i]!=null) && (arr[i] == item))
                    {
                        Array.Copy(arr, i + 1, arr, i, count - i  - 1);
                        arr[count--] = null;
                        return true;
                    }
                }
                return false;


        }
    }
}