C#擷取網頁上的控制項資訊

本人從dataset中擷取一些列資訊，通過某個欄位來判斷網頁上是否有與之對應的Label控制項，然後把這個欄位資料賦值給這個Label控制項。

         //通過迴圈得到網頁上的label
        if (ds.Tables[0].Rows.Count > 0)
        {
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                //通過迴圈得到網頁上的label
                foreach (Control c in Page.Controls)
                {
                    foreach (Control childc in c.Controls)
                    {
                        if (childc is Label)
                        {
                            if (((Label)childc).ID.Length > 4)
                            {
                              //判斷，截取Label控制項資訊進行判斷
                                if (((Label)childc).ID.Substring(3, 3) == ds.Tables[0].Rows[i]["r_gwdm"].ToString())
                                {
                                    ((Label)childc).Text = ds.Tables[0].Rows[i]["sl"].ToString();//賦值
                                }
                            }
                        }
                    }
                }
            }
        }