: Ensure your project targets .NET Framework 4.0 or higher , as recent versions of the toolkit do not support older frameworks.
: The full source code and latest releases are available on the official GitHub page . You can download the source as a .zip file by clicking the Code button and selecting Download ZIP . Download Ajax Control Toolkit zip
: Remember that most toolkit controls require a ScriptManager or ToolkitScriptManager on the page to function correctly. : Ensure your project targets