How can I add a Microsoft AJAX auto-loading textbox to an existing ASP.NET 3.5 SP1 web application project?
I don't know how to do this using Ajax.Net. However, I love to use jQuery for as many Ajax / JavaScript files as possible. it is clean, simple and fast.
So, can I recommend the jQuery Autocomplete plugin? http://www.pengoworks.com/workshop/jquery/autocomplete.htm
Edit: So there is an Ajax.net version There is a tutorial here: http://www.asp.net/learn/AJAX-videos/video-122.aspx
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Here's a link to a sample autocomplete for the AJAX Control toolkit . It's a bit tricky to set up because you need to configure and maintain the web service. If I was starting from scratch, I would probably use Damien's jQuery method. I wouldn't be surprised if the next version of the AJAX Control Toolkit has been rewritten using jQuery since the ScottGu team approved it last October.
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If you run into bizarre scripting errors after integrating AjaxControlToolkit into an existing site, check that you have configured your web.config correctly (including version numbers for referenced assemblies). You might want to create a new "dummy" AJAX website in Visual Studio using the AJAX template to see what you need in the web.config.
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