By default only a few Web Forms server control events trigger a postback to the server. Common user interface events such as mouse moves and key presses are not automatically posted to the server.

Question

By default only a few Web Forms server control events trigger a postback to the server.  Common user interface events such as mouse moves and key presses are not automatically posted to the server.

Quizplus · Accepted Answer

Web Forms server controls are designed to minimize unnecessary traffic between the client and server. By default, only specific events like button clicks trigger a postback, while others like mouse moves and key presses do not, unless explicitly handled to do so.

By Default Only a Few Web Forms Server Control Events