C#

delegate void dAddListItem(string cItem);

private void StartThreadHere()
{
    string cListItem="Item2";

    if (this.listView1.InvokeRequired)
    {
        dAddListItem delAddItem = new dAddListItem(AddListItem);
        this.listView1.Invoke(delAddItem, cListItem);
    }
    else
    {
        this.listView1.Items.Add(cListItem);
    }
}

private void AddListItem(string cItemToAdd)
{
    this.listView1.Items.Add(cItemToAdd);
}

private void Form1_Load(object sender, EventArgs e)
{

    this.listView1.Items.Add("Item1");

    Thread t = new Thread(new ThreadStart(StartThreadHere));
    t.Start();
}