asp.net动态生成控件及访问控件

asp.net动态生成控件的方法：
1.在aspx页面放一个Panel控件
2.代码如下:

private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            if(Session["p_userid"]==null||Session["p_loginName"]==null||Session["p_created"]==null)
            {
                Response.Write("<script>alert('请先登陆');location.href='../loginProc/login.aspx';</script>");
                Response.End();
            }
            else
            {
                Panel1.Controls.Add(new LiteralControl("<table>"));
                Panel1.Controls.Add(new LiteralControl("\n"));
                SqlCommand cmd=new SqlCommand("select infos.* from infos,infoGroups where infos.infoGroup_id = infoGroups.id and infoGroups.title='联系方式' order by infos.pri",connPartner);
                SqlDataAdapter da=new SqlDataAdapter();
                DataSet ds=new DataSet();
                da.SelectCommand=cmd;
                da.Fill(ds,"infos");
                for (int i=0;i<ds.Tables[0].Rows.Count;i++)
                {
                    Panel1.Controls.Add(new LiteralControl("<tr>"));
                    TableCell cell = new TableCell();//创建单元格,也就是第一列
                    cell.Text=ds.Tables[0].Rows[i]["title"].ToString();//设置单元格内的文本
                    Panel1.Controls.Add(cell);
                    Panel1.Controls.Add(new LiteralControl("<td>"));
                    TextBox textBox=new TextBox();
                    textBox.ID="t"+ds.Tables[0].Rows[i]["id"].ToString();
                    Panel1.Controls.Add(textBox);
                    Panel1.Controls.Add(new LiteralControl("</td>"));
                    Panel1.Controls.Add(new LiteralControl("<td>"));
                    Label lb=new Label();
                    lb.ID="l"+ds.Tables[0].Rows[i]["id"].ToString();
                    lb.Text="&nbsp;"+ds.Tables[0].Rows[i]["tip"].ToString();
                    lb.CssClass="registerInfo";
                    Panel1.Controls.Add(lb);
                    Panel1.Controls.Add(new LiteralControl("</td>"));
                    Panel1.Controls.Add(new LiteralControl("</tr>"));
                    Panel1.Controls.Add(new LiteralControl("\n"));
                }
                
                Button rebt=new Button();
                rebt.ID="redirect";
                rebt.Text=" 不填了 ";
                rebt.Click+=new EventHandler(rebt_Click);
                Panel1.Controls.Add(rebt);
            }
        }
private void rebt_Click(object sender, EventArgs e)
        {
            Response.Redirect("../partnerProc/default.html");
        }

访问动态生成控件，可以通过FindControl方法，代码如下:

for(int i=0;i<ds.Tables[0].Rows.Count;i++)
            {
                Label lb;
                lb=(Label)Panel1.FindControl("l"+ds.Tables[0].Rows[i]["id"].ToString());
                if(lb!=null)
                {
                    lb.Text="&nbsp;"+ds.Tables[0].Rows[i]["tip"].ToString();
                    lb.CssClass="registerInfo";
                }
            }