The Ajax Control Toolkit contains a rich set of controls that you can use to build highly responsive and interactive Ajax-enabled ASP.NET Web Forms applications. Follow the steps below to download and start using the Ajax Control Toolkit with Visual Studio:
Click the Downloads tab at the CodePlex site to see the list of available Ajax Control Toolkit downloads. If you are using Visual Studio 2008 then you should pick the version of the Ajax Control Toolkit for .NET 3.5. If you are using Visual Studio 2010 then you can use either the .NET 4 or .NET 3.5 versions of the Ajax Control Toolkit.
Download the Binary version and not the Source version of the Ajax Control Toolkit. You should download the Source version of the Ajax Control Toolkit only when you are interested in extending the Ajax Control Toolkit.
Next, right-click the compressed file and select the Extract All menu option.
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