protected string GetUserPreName(int id) { BLL.users bll = new BLL.users(); string preName = string.Empty; DataTable dt = bll.GetPreUserInfo(id).Tables[0];//获取该用户上线信息 if (dt.Rows.Count > 0) { preName = dt.Rows[0]["nick_name"].ToString(); } else { preName = "暂无上线"; } return(preName); }