If it's a CMS you mean, I've heard good things about DotNetNuke (http://www.dotnetnuke.com/) (although I've never used it myself).
Rolling your own system can also be a rewarding experience.
Check out http://www.asp.net/community/projects/ for other starter kits and open source systems.
Cupiditas and littleguru ,I'm very thankful for your help.I'm not meanint the web hoster, because I have it.It supports ASP/ASP.NET/PHP/Wap.I want to find a programming for the internet such as wordpress.