Resolving "No license found for Telerik UI for ASP.NET AJAX"

Environment

Product	UI for ASP.NET AJAX
Version	2025 Q1 +

Description

I encounter the error No license found for Telerik UI for ASP.NET AJAX or We couldn't verify your license key for Telerik UI for ASP.NET AJA despite having a valid license and ensuring the license key has been downloaded into Visual Studio. This issue happens in both local development and publishing environments.

Cause

The error occurs because Visual Studio cannot locate or validate the required license file or Script key attribute for Telerik UI for ASP.NET AJAX. The license activation process varies based on the ASP.NET Web Forms project type, which is either a Web Application or a Web Site project.

Solution

To resolve the issue, follow the steps based on your project type:

For Web Application Projects (have a .csproj or .vbproj file):

Using NuGet

1. Install the latest Telerik.Licensing NuGet package.
2. Download the telerik-license.txt file from the License Keys page.
3. Place the telerik-license.txt file in %AppData%\Telerik\ (e.g., C:\Users\YourUserName\AppData\Roaming\Telerik\).
4. Rebuild the project.

Without NuGet

1. Go to the License Keys page in your Telerik account.
2. Click the Script key link in the Telerik UI for ASP.NET AJAX row.
3. Select your preferred language and copy the license key.
4. Add the license key as an assembly attribute in AssemblyInfo.cs or create a new file like TelerikLicense.cs:

csharp

[assembly: global::Telerik.Licensing.EvidenceAttribute("your-license-key-here")]

For VB.NET projects, use:

vb

<Assembly: Telerik.Licensing.EvidenceAttribute("your-license-key-here")>

5. Rebuild the project.

For Web Site Projects

1. Go to the License Keys page in your Telerik account.
2. Click the Script key link in the Telerik UI for ASP.NET AJAX row.
3. Select your preferred language and copy the license key.
4. Add a CS class file (e.g., TelerikLicense.cs) to the App_Code folder.
5. Paste the license key as an assembly attribute:

csharp

[assembly: global::Telerik.Licensing.EvidenceAttribute("your-license-key-here")]

For VB.NET projects, use:

vb

<Assembly: Telerik.Licensing.EvidenceAttribute("your-license-key-here")>

6. Rebuild your site and restart Visual Studio.

See Also

• Setting Up Your Telerik UI for ASP.NET AJAX License Key
• Web Applications with NuGet Licensing
• Web Applications without NuGet and Web Sites Licensing
• Telerik.Licensing NuGet Package
• YouTube Video: Fix Telerik UI for ASP.NET AJAX License Error Banner & Watermarks (NuGet)
• YouTube Video: Removing Telerik AJAX License Error without NuGet
• YouTube Video: Fix Telerik UI License Error in ASP.NET Web Forms Site