[求助] listView 的用法

public void lvUserList_ItemMouseHover(object sender, System.Windows.Forms.ListViewItemMouseHoverEventArgs e)
        {
            ListViewItem item = e.Item;
            string NickName = item.SubItems[3].Text;
            string Email = item.SubItems[6].Text;
            string Signature = item.SubItems[7].Text;
            string IpAddress = (item.SubItems[5].Text == "") ? "未上线" : item.SubItems[5].Text;
            string text = string.Format("昵称：{0}\r\nEmail：{1}\r\nIP：{2}\r\n签名：{3}", NickName, Email, IpAddress, Signature);
            this.toolTip.SetToolTip(this.lvUserList, text);
        }
这是我写的一段让鼠标移到某一项上面显示该项的详细信息，但鼠标移走详细信息还跟着鼠标，请问各位大哥怎么办？