How to dynamically set global theme and read pages node content in Web. config.

I have been trying to find a simple method to dynamically update theme settings for the entire site of ASP. net2.0, but I have not found it yet. I still use the old method. Every page is overwritten by page. theme = mypage. currenttheme; this is achieved by dynamically updating the global variable mypage. currenttheme.

The default theme is set in Web. config. The configuration nodes are as follows:
<System. Web>
<Pages theme = "default"/>
</System. Web>
Many people do not know how to read theme values.Code.

System. Web. configuration. pagessection PS = (System. Web. configuration. pagessection) system. configuration. configurationmanager. getsection ( " System. Web/pages " );

Textbox1.text = PS. theme;

I also hope someone can solve my problem. Thank you.