用线程在后台运行. private void btnRefreshSRVList_Click(object sender, System.EventArgs e)
{
this.btnRefreshSRVList.Enabled=false;
Thread t1 = new Thread(new ThreadStart(ChangeCaption_RefreshDBList));
t1.Name = "RefreshSRVList";
t1.IsBackground = true;
t1.Start();
}