C#

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Authentication[] array = new Authentication[n];
//TODO fill the array
foreach(Authentication item in array)
{
   item.method1();
}

AuthenticationCollection: Collection<Authentication>{}

AuthenticationCollection items = new AuthenticationCollection(n);

// for-each is the same

using System.Collections.Generic;

namespace TestNamespace
{
    class Authentication
    {
        public void method1()
        {
        }
    }

    class AuthenticationCollection
    {
        private List<Authentication> _Items;
        public List<Authentication> Items
        {
            get
            {
                return _Items;
            }
            set
            {
                _Items = value;
            }
        }
        public AuthenticationCollection()
        {
            _Items = new List<Authentication>();
        }
    }
}

using System.Windows.Forms;
using TestNamespace;

namespace MyApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Load += new System.EventHandler(Form1_Load);
        }

        void Form1_Load(object sender, System.EventArgs e)
        {
            Authentication myAuth1 = new Authentication();
            Authentication myAuth2 = new Authentication();
            AuthenticationCollection myCollection = new AuthenticationCollection();
            myCollection.Items.Add(myAuth1);
            myCollection.Items.Add(myAuth2);
            myCollection.Items[0].method1();
        }
    }
}