What is the limitation with update panel?

Advantages:-

1.)Easy to use and configure (Well, I don't know of any other advantages!)

Disadvantages:-

1.)It is evil & dangerous to use.But it can be used in some places.

Using update panel, you cannot validate outside controls.
For example:

There is a grid in an update panel and you want to validate the grid's field having a button outside the update panel. Validation will be executed but does not affect the page due to the update panel. So to solve this kind of problem, we have placed a button in another update panel.


For more please see these links

http://encosia.com/why-aspnet-ajax-updatepanels-are-dangerous/

forums.asp.net/t/1430753.aspx

Thanks Sir.