遍历页面的元素

public void test()
        {
            foreach(System.Web.UI.Control cc in  this.Controls)
            {
                
                if(cc.HasControls())
                {
                
                    foreach(System.Web.UI.Control con in cc.Controls)
                    { 
                        Response.Write(con.UniqueID.ToString());
                        if(con is System.Web.UI.WebControls.TextBox)
                        {
                            System.Web.UI.WebControls.TextBox tb=(System.Web.UI.WebControls.TextBox)con;
                            tb.Text="nihao";
                        }

                    }
                }
                }
        }

注意：TextBox放到别的控件里面的