Download Ajax Control Toolkit Zip -

Browse to the AjaxControlToolkit.dll to populate the list with controls like CalendarExtender , Accordion , and ModalPopupExtender . ⚠️ Security & Versioning Note

: 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 Avoid third-party "driver download" sites or unofficial mirrors, as these may contain outdated versions or bundled malware. Download Ajax Control Toolkit zip

: If you download the DLLs manually, right-click References in your project, select Add Reference , and browse to the extracted AjaxControlToolkit.dll . Browse to the AjaxControlToolkit

Right-click the Toolbox and select (name it "AJAX Toolkit"). Right-click inside the new tab and select Choose Items . right-click References in your project

: To see the controls in your Visual Studio Toolbox: