User-1910946339 posted
Web pages use a different layout mechanism from WinForms applications (nothing to do with C#, its the UI technology that you are using).
Web layout used to be done primarily using tables but the general approach now is to use CSS for styling of pages. There will be a gazillion page in the internet about how to style using CSS. For inspiration have a look at
http://www.csszengarden.com/ or
http://alistapart.com/
Remember web pages can be viewed on desktop computers with giant monitors or on mobile phones with tiny screens, specifying exact positioning in the style that desktop applications do is normally not a good idea on the web.