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

namespace CustomStack
{
    public class StackOfString : Stack<string>
    {
        public bool IsEmpty()
        {
            if (Count == 0)
            {
                return true;
            }
            return false;
        }

        public void AddRange(IEnumerable<string> elements)
        {
            foreach (var item in elements)
            {
                Push(item);
            }
        }
    }
}


using System;

namespace CustomStack
{
    public class StartUp
    {
        static void Main(string[] args)
        {
            StackOfString myStack = new StackOfString();

            Console.WriteLine(myStack.IsEmpty());

            string[] array = new string[10];

            for (int i = 0; i < array.Length; i++)
            {
                array[i] = $"element{i}";
            }

            myStack.AddRange(array);

            Console.WriteLine(myStack.Count);
        }
    }
}