RadControls for ASP.NET AJAX
Visual Studio 2010 automatically enables IntelliSense - it detects all classes, properties and methods in the DLL file and the JavaScript code.
For additional convenience Telerik RadControls for ASP.NET AJAX come with an XML file which contains the comments for their classes, properties and methods.When Telerik Control is dragged to the webform the XML file is automatically added in the bin directory of the project. In ASPX, when you start typing or when you insert a space, VisualStudio will show a dropdown with suggestions for autocomplete:
Visual Studio 2010 provides full Javascript IntelliSense completion in ASPX files, HTM files, as well as in external JS files. It provides rich support for the ASP.NET AJAX client JavaScript framework and JavaScript code built with it:
RadControls for ASP.NET AJAX also expose JavaScript IntelliSense for their client scripts under VS 2010. For more information refer to this blog post.
In code-behind, each time a particular class/property/method is being selected from the dropdown of the autocomplete functionality, a tooltip with the comment for this class/property/method is displayed.