RiaService+ToLinq+silverlight实现修改
StaffTable sd = (StaffTable)this.StaffData.SelectedItem;

var m = new DostaffContext();
sd.name = "aa";
sd.phone = "bb";


m.SubmitChanges();


这个修改怎么只在页面上更新了，但是没有把数据库的更新了，是怎么回事呢？请高人指点
[解决办法]

StaffTable sd = (StaffTable)this.StaffData.SelectedItem;

  var m = new DostaffContext();
    var newSd=m.StaffTable.SingleOrDefault(t=>t.ID==sd.ID);
  newSd.name = "aa";
  newSd.phone = "bb";

    
  m.SubmitChanges();