Ensure the method is called before the first licensed control is created. Verify the key string (no extra spaces, correct encoding). 2. LicenseExpiredException Cause: The license key has passed its expiration date (common for annual subscriptions).
Introduction In commercial software development, many UI component libraries (e.g., Telerik, DevExpress, Syncfusion) and proprietary frameworks require a valid license key to operate in a production environment. The licenseinfo.setlicensekey method is a common API pattern used to apply a license key programmatically before using licensed controls or libraries.
else
Renew your subscription and obtain a new license key. 3. Method Has No Effect Cause: Some vendors require also installing a .licx file or registry entry; setlicensekey only supplements, not replaces, design-time licensing.
[STAThread] static void Main()
using Telerik.Licensing; public class Program
public static void Main(string[] args)
throw new InvalidOperationException("License key not found in environment.");
LicenseInfo.SetLicenseKey(licenseKey);
string? licenseKey = Environment.GetEnvironmentVariable("UI_LICENSE_KEY"); if (!string.IsNullOrEmpty(licenseKey))
| Vendor | Namespace | Additional Requirements | |--------|-----------|--------------------------| | Telerik | Telerik.Licensing | Must call before any Telerik control is instantiated. | | DevExpress | DevExpress.Data | Also requires adding a license file for design-time. | | Syncfusion | Syncfusion.Licensing | Use SyncfusionLicenseProvider.RegisterLicense() instead. | | GrapeCity (ComponentOne) | C1.Licensing | Use C1License.SetLicenseKey() . | licenseinfo.setlicensekey