page theme

the problem has been solved.. thank you all for the help

hi HAzel, Refere this link https://msdn.microsoft.com/en-us/library/wtxbf3hh.aspx

Hi Hazel ,

You can use Master Pages to Implement Theme throughout the site

If helpful mark as Correct answer

you can use global.asax file to set the theme for whole website.Please find the below link for your reference.

https://www.daniweb.com/web-development/aspnet/threads/129821/applying-themes-to-a-whole-website