Sounds like you have a few things going on. I'd check the site you're trying to perform these actions on and see where the connection string is pointing to.
Secondly, perform an IIS reset on the website, recycle the app pool and restart the website. Might be an issue with caching of db connection.
Thirdly, check the actual file system to see if the ~/CMSWebParts/BizForm/bizform.ascx actually exists in your site.