: Ensure your project targets .NET Framework 4.0 or higher , as recent versions of the toolkit do not support older frameworks.
: Right-click your project in Visual Studio, select Manage NuGet Packages , search for "AjaxControlToolkit," and click install. Download Ajax Control Toolkit zip
: Only download the toolkit from GitHub , NuGet , or DevExpress . Avoid third-party "driver download" sites or unofficial mirrors, as these may contain outdated versions or bundled malware. : Ensure your project targets
: Remember that most toolkit controls require a ScriptManager or ToolkitScriptManager on the page to function correctly. select Manage NuGet Packages
: To see the controls in your Visual Studio Toolbox: