Control Invoke

Control calls without Invoke (with delegate) from other thread sometimes works but throws exception in Visual Studio

For example modifying the example from http://msdn.microsoft.com/en-US/library/a1hetckb(v=vs.80) to read
expand collapse

public void Run()

        {

            myFormControl1.myListBox.Items.Add("test from thread");


...

works in non-debug mode:

Full Code: expand collapse

namespace WindowsFormsApplication1
{
    public partial class MyFormControl : Form
    {
        public delegate void AddListItem(string myString);
        public AddListItem myDelegate;
        private Button myButton;
        private Thread myThread;
        public ListBox myListBox;
        private Button myNoThreadButton;

        public MyFormControl()
        {
            //InitializeComponent();
            myButton = new Button();
            myNoThreadButton = new Button();

            myListBox = new ListBox();

            myButton.Location = new Point(72, 160);
            myButton.Size = new Size(152, 32);
            myButton.TabIndex = 1;
            myButton.Text = "Add items in list box";
            myButton.Click += new EventHandler(Button_Click);

            myNoThreadButton.Location = new Point(70, 190);
            myNoThreadButton.Size = new Size(100, 32);
            myNoThreadButton.Text = "Add items No thread created";
            myNoThreadButton.Click += new EventHandler(ButtonNoThread_Click);


            myListBox.Location = new Point(48, 32);
            myListBox.Name = "myListBox";
            myListBox.Size = new Size(200, 95);
            myListBox.TabIndex = 2;

            ClientSize = new Size(332, 333);
            Controls.AddRange(new Control[] { myListBox, myButton, myNoThreadButton });
            Text = " 'Control_Invoke' example ";
            myDelegate = new AddListItem(AddListItemMethod);

        }
        static void Main()
        {
            MyFormControl myForm = new MyFormControl();
            myForm.ShowDialog();
        }
        public void AddListItemMethod(String myString)
        {
            myListBox.Items.Add(myString);
        }
        private void Button_Click(object sender, EventArgs e)
        {
            myThread = new Thread(new ThreadStart(ThreadFunction));
            myThread.Start();
        }
        private void ButtonNoThread_Click(object sender, EventArgs e)
        {
            for (int i = 1; i <= 5; i++)
            {
               string myString = "(no thread) Step number " + i.ToString() + " executed";
               AddListItemMethod(myString);

            }
        }
        private void ThreadFunction()
        {
            MyThreadClass myThreadClassObject = new MyThreadClass(this);
            myThreadClassObject.Run();
        }

    }
    public class MyThreadClass
    {
        MyFormControl myFormControl1;
        public MyThreadClass(MyFormControl myForm)
        {
            myFormControl1 = myForm;
        }
        String myString;

        public void Run()
        {
            myFormControl1.myListBox.Items.Add("test from thread");


            for (int i = 1; i <= 5; i++)
            {
                myString = "Step number " + i.ToString() + " executed";
                Thread.Sleep(400);
                // Execute the specified delegate on the thread that owns
                // 'myFormControl1' control's underlying window handle with
                // the specified list of arguments.
                myFormControl1.Invoke(myFormControl1.myDelegate,
                                       new Object[] { myString });
            }
        }
    }