Esri License Status Codes.
| Constant | Value | Description | 
| esriLicenseAvailable | 10 | The Product/Extension is licensed and available. | 
| esriLicenseNotLicensed | 20 | This Product/Extension is not licensed. | 
| esriLicenseUnavailable | 30 | The Product/Extension is licensed but unavailable. | 
| esriLicenseFailure | 40 | There has been a licensing Failure. | 
| esriLicenseAlreadyInitialized | 50 | The Product license has already been initialized. Initialization can only be performed once. | 
| esriLicenseNotInitialized | 60 | The Product license has not been initialized. | 
| esriLicenseCheckedOut | 70 | The Product/Extension has been checked out successfully. | 
| esriLicenseCheckedIn | 80 | The Product/Extension has been checked in successfully. | 
| esriLicenseUntrusted | 90 | The Product/Extension license is untrusted and needs to be repaired. | 
 
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server. 
.NET Snippets
Check Out Extension License