遍历ASP.Net页面的某个控件

foreach (System.Web.UI.Control ctl in this.Controls)              {                 if (ctl.GetType() == typeof(ImageButton))                    {                        if (i < dt.Rows.Count)                        {                            ImageButton pImg = (ImageButton)ctl;                            pImg.ImageUrl = Page.ResolveUrl("~" + dt.Rows[i]["SimpleImgUrl"].ToString());                            i++;                         }                     }              }