替换所有空格

Entity.Name = Regex.Replace(dt.Rows[i]["行政值日"].ToString().Trim().Replace(" ", "").Replace("　", ""), @"s", "");
                        Entity.Riqi = dt.Rows[i]["日期"].ToString().Trim().ToDateTime().ToString("yyyyMMdd");
                        Entity.Leader = Regex.Replace(dt.Rows[i]["行政值日"].ToString().Replace(" ","").Replace("　","").Trim(), @"s", "");
                        Entity.Teacher = Regex.Replace(dt.Rows[i]["老师值日"].ToString().Trim(), @"s", "");