What are the 3 types of Server Control Events? -interview04032012

Server controls, such as a Button, TextBox, and DropDownList, each have their own sets of events that occur in response to user actions. However, not all server control events are created equal. There are three types of server control events as listed below. Postback events : These events cause the Web page to be sent back to the server for immediate processing. Postback events affect perceived performance because they trigger a round-trip to the server. A Button control triggers a postback event. A dropdowinlist can also trigger a post back if the AutoPostBack property of the DropDownList is set to true, else a dropdownlist triggers a cached event. The same is the case with a TextBox. Cached events : These events are saved in the page’s view state to be processed when a postback event occurs. A DropDownList and a TextBox can trigger a cached event if the AutoPostBack property is set to false. Validation events : These events are handled on the page without posting back or caching. The validation server controls use these types of events.