Custom extenders, like custom controls, will have more
volatility toward change on the server-side than on the client side. When
developing components using the ASP.NET AJAX framework (not shown here) or the
AJAXControlToolkit, there are some differences between the two approaches. But
and it does not really change. In the future, as new additions come out from
Microsoft, it still will not change as much as the server-code can, which is a
Developing these scripts by hand can be more difficult
though, simply because of the sheer volume of code. I use CodeSmith Studio to
generate my ASP.NET AJAX code, which I custom developed a script for my need. It
was not overtly difficult to setup, and the benefits paid off immediately.
Once you learn the constructs to ASP.NET AJAX, it stays the
same, so the major challenge is the initial learning curve. After that, the
scripting portion is not that difficult at all; most of the difficulty comes
from figuring out the complex processing logic and state management aspects.