Licenseinfo.setlicensekey -

// Custom internal implementation LicenseInfo.SetLicenseKey(string productName, string licenseKey);

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.

CreateHostBuilder(args).Build().Run();

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).

| 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

else

// Set license key as early as possible LicenseInfo.SetLicenseKey("YOUR_LICENSE_KEY_HERE"); // Custom internal implementation LicenseInfo

string? licenseKey = Environment.GetEnvironmentVariable("UI_LICENSE_KEY"); if (!string.IsNullOrEmpty(licenseKey))

// Telerik UI for WinForms / ASP.NET LicenseInfo.SetLicenseKey(string licenseKey); // DevExpress LicenseInfo.SetLicenseKey(string licenseKey); Verify the key string (no extra spaces, correct encoding)