在C#中创建DIV并向其添加控件

我有以下内容在c#的asp页面上添加了一个布局

chart_holder.Controls.Add(new LiteralControl("
" +
                        "" +
                         "
" +
                            "
 " +
                               "
" +
                                   "
 " +
                                        "
 Excel
 " +
                                        "
 PDF
" +
                                            "
Image 
" +
                                       " 
" +
                                    "
" +
                                "
" +
                            "
" +
                            "
" +
                                "" +
                            "
" +
                            "
" +
                                "" +
                            "
" +
                       " 
" +
                       "
 
" +

                       "" +
                    "
"));

然后我想最终在上面的一个div中添加一个图表.无论如何我可以访问div然后添加一个控件...？

以前我有以下

chart1_holder.Controls.Add(chart_location_1);

但是chart1_holder来自asp页面,而不是动态的.