.NET problem: "Illegal cross-thread operation:..."

cum de accesat un obiect a formei dintr-un thread...de ex am un ListView1 in Form1 shi am o metoda my_method()shi intrinsa asha un randListView1.Items.Add("xxx");dar nu lucreza....imi da Exceptia Illegal cross-thread operation: Control 'urlList' accessed from a thread other than the thread it was created on