Are you confused about how to install ASP.NET AJAX? I know I am. Well, I'm still learning about asp.net ajax, but here's what I've got so far.
Do I need the installer or not?
Originally, you would download and install some ajax libraries on top of asp.net 2.0, and you can still do that if you are using an older version of .net. But with .net 3.5, the ajax libries are built into asp.net, so you don't have to install any additional components. For more 3.5 info, see Scott Guthrie's Blog.
How does it work with SharePoint?
I need ajax for my web parts on sharepoint. Here's a useful link for getting ajax working in sharepoint. Also, if you're new to asp.net ajax, you can check out Robert Foster's book ASP.NET 3.5 AJAX UNLEASHED.
What if I don't configure AJAX (3.5) in my web.config?
I haven't thoroughly tested this (don't know if I will), but I found that if I put a button on an update panel (as in ajax 3.5 unleashed), it will do a postback instead of doing a callback (the page flickers). Other than that, everything seemed to work just fine. Again, haven't tested anything more, but I just thought this was interesting to find out.
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