//右键选中项弹出菜单
private void listViewtask1_MouseClick(object sender, MouseEventArgs e)
{
ListView _ListView = (ListView)sender;
ListViewItem _Item = _ListView.GetItemAt(e.X, e.Y);
if (_Item != null)
{
this.contextMenuStrip2.Show(_ListView, e.X, e.Y);
}
else
{
return;
}
}