I want to webpage to look like a winform but it is actually a webform. The users should think that it is a form and not a webpage
Web forms will generate pages in html, like the one you are looking at right now. Win forms applications generate interfaces using the windows operating system, so they look much better.
It's not possible to get web forms to look like win forms, but you can get close if you use something like www.silverlight.net which allows you to embed a rich client experience within a web browser on multiple platforms
You can design a web page to look however you want, including the look (if not exactly the behavior) of a windows form. However the page will still run in a browser, with toolbars and so on.
With hta files in windows, you can create a HTML page that executes as a windows app, outside of a browser. It is something like that you are looking for?
You may want to check this out: http://www.visualwebgui.com/
Then again, you can only go so far with this approach. It will not look 100% exactly like a Windows app, and it will not be able to function 100% exactly like a Windows app.
I want a steak to taste like icecream but it is actually a steak. The eaters should think that it is icecream and not a steak.
Why are you kidding your users?