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Explain the difference between Server control and HTML control.

Server events
Server control events are handled in the server whereas HTML control events are handled in the page.

State management
Server controls can maintain data across requests using view state whereas HTML controls have no such mechanism to store data between requests.

Browser detection
Server controls can detect browser automatically and adapt display of control accordingly whereas HTML controls can't detect browser automatically.

Properties
Server controls contain properties whereas HTML controls have attributes only.