Unable to place Telerik controls in Visual Studio toolbox after 2025 Q1
Environment
| Product | Progress® Telerik® UI for ASP.NET AJAX |
| Version | 2025.1.211 |
Description
After installing the 2025 Q1 release of Telerik UI for ASP.NET AJAX, the Telerik controls disappeared from the Visual Studio toolbox, making it impossible to place the Telerik controls again.
Cause
The issue is due to the 2025 Q1 MSI installer not placing the Telerik.Licensing.Runtime.dll (which is now referenced by the Telerik.Web.UI.dll assembly) in the Bin folder. This omission prevents the Toolbox from recognizing the controls.
Solution
To resolve the issue, manually copy the Telerik.Licensing.Runtime.dll into the same directory as the Telerik.Web.UI.dll. For example, copy it to C:\Program Files (x86)\Progress\Telerik UI for ASP.NET AJAX 2025 Q1\Bin462\. After copying the DLL, re-add the controls to the Visual Studio Toolbox. This manual workaround has been confirmed by several users to resolve the problem.
A fix is currently in progress, and a hotfix release is targeted for the near future, which should eliminate the need for this manual step.
For more details on this issue, see the bug report: AJAX Visual Studio extensions don't add Telerik references when creating or upgrading projects.