I'm using ObjectListView with checkboxes, I would like to run a function on selected items to delete them. So i tried this Method but it not working:

private List<Matricule> matrs;
private void button1_Click(object sender, EventArgs e)
        {
            //List<Song> s = this.olvSongs.CheckedObjects.Count;
            //MessageBox.Show(this.olvSongs.CheckedItems.Count + "  " + this.olvSongs.CheckedObjects.Count);

            string s = "";
            foreach (var item in olvMatrs.SelectedItems)
            {
                matrs.Remove((Matricule)item);
            }
this.olvSongs.SetObjects(matrs);
        }

how can i do this task.