数据转化有关问题

数据转化问题
<%@   Page   Language= "C# "   %>
<%@Import   Namespace= "System.Data "%>
<%@Import   Namespace= "System.Data.OleDb "%>
<Script   runat= "server ">
void   Page_Load(Object   Src,   EventArgs   E)   {
OleDbConnection   Conn=new   OleDbConnection( "Provider=Microsoft.Jet.OLEDB.4.0; "+
"Data   Source= "+Server.MapPath( "person.mdb "));
Conn.Open();
string   strSQL= "select   *   from   grade; ";
OleDbDataAdapter   da=new   OleDbDataAdapter(strSQL,   Conn);
DataSet   ds   =   new   DataSet();
da.Fill(ds, "grade ");
DataTable   dt   =   ds.Tables[ "grade "];
DataRow   row   =   dt.NewRow();
row[ "学号 "]   =   "199 ";
row[ "姓名 "]   =   "小布什 ";
row[ "数学 "]   =   58;
dt.Rows.Add(row);
OleDbCommandBuilder   cb   =   new   OleDbCommandBuilder(da);
da.Update(ds, "grade ");
dg.DataSource   =   ds.Tables[ "grade "].DefaultView;
dg.DataBind();
Conn.Close();
}
</script>
<ASP:DataGrid   id= "dg "   runat= "server "/>


书上说     “OleDbCommandBuilder   cb   =   new   OleDbCommandBuilder(da)”的功能是对新加的数据行进行转换，但是我看不懂，敬请高手指点，谢谢

------解决方案--------------------------------------------------------
沙发，帮忙顶