private void listView2_SelectedIndexChanged(object sender, EventArgs e)
{
if (listView2.SelectedItems.Count > 0)
{
ListViewItem item = listView2.SelectedItems[0];
String field = item.Text;
listView3.Items.Clear();
listView3.Items.AddRange(preview_articles.show_preview(field));
listView3.EndUpdate();
dbm.setting.edgeCol = field;
}
}