列表框触发它自己当我添加项目

如何防止SelectedIndexChanged触发列表框时，我添加新的项目?它会触发我添加的每一项。

    private void lb_accounts_SelectedIndexChanged(object sender, EventArgs e)
    {
        var selectedProperty = (KeyValuePair<string, string>)lb_accounts.SelectedItem;
        fb.AccessToken = selectedProperty.Key;

        dynamic albums = fb.Get("/me/albums");
        Dictionary<string, string> list = new Dictionary<string, string>();
        foreach (dynamic album in albums.data)
        {
            list.Add(album.id, album.name);
        }
        lb_albums.DataSource = new BindingSource(list, null);
        lb_albums.DisplayMember = "Value";
        lb_albums.ValueMember = "Key";
    }