if(UpdClassStudset.HasChanges())
{
UpdSconn=new SqlConnection(UpdStuconnstr);
UpdStuGrdsqlda=new SqlDataAdapter(this.UpdStustrconnClass,this.UpdSconn);
SqlComm=new SqlCommandBuilder(UpdStuGrdsqlda);
this.UpdStuGrdsqlda.Update(this.UpdClassStudset.GetChanges(),"student");
MessageBox.Show("保存修改成功！","信息");   

在运行过程中，有对DataGrid里数据进行修改，但一运行上述保存代码，它就弹出“对于不返回任何键列信息的ＳelectCommand不支持UpdateCommand的动态SQL生成“，请问这是什么意思，要怎样修改过之后才能正常运行，谢谢指点！                                                                                                                                                                                                                                                                                                                                                         
                }

我设置了主键，主键是Course_id，设置了标识，自动增长了，但还是显示该问题。谢谢各位解答！