public void InternalsTest_VariableOutsideLoop()
        {
            var strings = new List<string> {"one", "two", "three"};
            var buttons = new List<Button>();

            var displayClass = new DisplayClass();

            for (int index = 0; index < strings.Count; index++)
            {
                displayClass.str = strings[index];
                var btn = new Button();
                btn.Click += displayClass.action;
                buttons.Add(btn);
            }

            buttons.ForEach(x => x.PerformClick());
        }

        private sealed class DisplayClass
        {
            public string str { get; set; }

            public void action(object sender, EventArgs e)
            {
                MessageBox.Show(str);
            }
        }