Explain about updatepanel and its properties,mainly triggers?

Sir:

Explain about updatepanel and its properties,mainly triggers?

Basically, UpdatePanel enables sections of a page to be partially rendered without a postback.

For more info, go tohttp://asp.net/ajax/documentation/live/tutorials/IntroductionUpdatePanel.aspx

Explain about Asyncronous&Syncronouspostback?

Sir:

Explain about Asyncronous&Syncronouspostback?

Pls read the documentationhttp://ajax.asp.net/docs and check the video tutorialhttp://www.asp.net/ajax/documentation/