Cумма элементов массива

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
using System.Dynamic;
using System.Globalization;
using System.Linq;
using System.Runtime.Serialization;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace CSLight
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] numbers = new int[0];
            string command;
            int sumElement = 0;
            while(true)
            {
                for (int i = 0; i < numbers.Length; i++)
                {
                    Console.Write(numbers[i] + " ");
                }
                Console.WriteLine();
                Console.Write("Введите команду: ");
                command = Console.ReadLine();
                if(command.ToLower() == "exit")
                {
                    break;
                }
                else if(command.ToLower() == "sum")
                {
                    for(int i = 0; i < numbers.Length; i++)
                    {
                        sumElement += numbers[i];
                    }
                    Console.WriteLine($"Cумма элементов массива равна: {sumElement}.");
                    sumElement = 0;
                }
                else if(Convert.ToInt32(command) > int.MinValue && Convert.ToInt32(command) < int.MaxValue)
                {
                    int[] tempNumbers = new int[numbers.Length + 1];
                    for(int i = 0; i < numbers.Length; i++)
                    {
                        tempNumbers[i] = numbers[i];
                    }
                    tempNumbers[tempNumbers.Length - 1] = Convert.ToInt32(command);
                    numbers = tempNumbers;
                }
            }
        }
    }
}