I have encountered this error message in the past when I upgrade a few projects to 3.5 but it has been at least 3-4 months and found myself stuck with the same dilemma once again today. This error can be attributed to many things but mainly it comes down to web.config or ambigiouty in the references...

I have demo'ed this technique before and talked about it various times, but I recently used this on another engagement which really helped alleviate some of the initial page load times and size. In my scenario, we had a page utilising the AJAX Control toolkit and which utilised the excellent Tab control...

I've run across a few situations in which I wanted to animate a certain row in a GridView as a result of some client action.  The reason that this is a little tricky is that the AJAX Control Toolkit's Animation Extender needs to act on a certain Target Control (identified of course by the TargetControlID...

The ASP.NET AJAX Control Toolkit's Calendar ( Click Here To See The CalendarExtender Control In Action ) is a very nice control that allows you implement a client side dynamic calendar for date-picking functionality. One interesting feature is the ability to change the calendar from the default "days"...

Tuesday 30th October and Wednesday 31st October, I am doing a presentation on the AJAX Control Toolkit . It is part of the readify developer network series of presentations. I am doing a primer presentation which is more introductory and runs for a relatively short period of time. Chris Burrows will...

Had an issue on a current project where a page was being loaded twice for each request, although it was a little different for each browser. Under IE, this particular page was loaded, then the 'Default.aspx' page in the same directory was loaded. In Firefox, the same page was loaded twice. This was verified...

The past year or so I have been working with a number of excellent co-authors on another book called Beginning ASP.NET 2.0 AJAX and as you can imagine, is solely devoted to the topic of the Microsoft ASP.NET 2.0 AJAX Extensions . Well its out and you can go and grab yourself a copy . You probably want...

Apart from the long list of great, free controls in the AJAX Control toolkit , there are numerous other reasons to use the toolkit. One of which is the great support functions that come with the toolkit. One I had to use recently allowed me to figure out the width of an elements border and easily deduce...

Paul Glavich takes the stage and does a video on Extender Controls with the AJAX Control Toolkit. Subscribe. Original URL: http://aspnetpodcast.com/CS11/blogs/asp.net_podcast/archive/2007/02/15/asp-net-podcast-show-86-creating-extender-controls-with-the-ajax-control-toolkit-by-paul-glavich-video.aspx...

The CollapsiblePanelExtender is a cool way to convert simple panels to collapsible ones. It usually has a target panel, a control which can make it collapse, another (or the same) control to make it expand etc. Clicking the said controls will trigger the collapse/open behaviour. We may need to sometimes...