AJAX Control toolkit
The Asp.net AJAX Control Tool compartment gives a staggering number of choices to zest up the UI, while exploiting AJAX programming procedures that as of now have a positive impact on the UI.
While the Asp.net AJAX from Microsoft gives you essential AJAX help, the Asp.net AJAX Control Toolbox develops this by offering more controls and by permitting you to make controls. Perceive how you may utilize the Asp.net AJAX Control Tool compartment in your applications.
What is the Asp.net AJAX Control Kit anyways?
The kit tool is a to work with AJAX-empowered controls and extenders. It utilizes Asp.net AJAX extensions, which must be introduced to use the toolbox.
You can download the Asp.net AJAX Control Tool for free by means of the Asp.Net site. Adaptations are accessible for both .NET 2.0 and 3.5 an so on. You may download the full source code or simply the kit. When the compressed files has been downloaded, you decompress the compressed tools
People normally love to place the toolkit in the current project Bin folder or inside the installed Visual Studio Common7 folder
For installation, demos and controls installation guides, refer this link
Following are the third party ajax controls for the .Net
Xceed Grid for .NET
RapidSpell for .NET