The only way to do this is by re-creating the site in concrete5 - creating a new theme (if it needs to have the same design), and adding the pages and content. It would have to be rebuilt.

This isn't really a lacking in concrete5 though, websites generally can't be 'converted' to use other platforms. ASP.NET is a completely platform to what concrete5 runs too, so it would probably need a different server set up as well.

You have recreate your site in concrete5 with a designed theme.....if your site has some functionality then will be create some package or addon ....you can also download through the marketplace or purchased required addon..

Thanks....any more help would be appreciated