Enable ESRI ArcGIS extension licence from C#

Code snippet on enabling ESRI ArcGIS extension licence for spatial analysis using C#

   
       ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.Desktop);  
       ESRI.ArcGIS.RuntimeManager.BindLicense(ESRI.ArcGIS.ProductCode.Desktop);  
   
       UID pUid = new UIDClass();  
       pUid.Value = "esriSpatialAnalystUI.SAExtension";  
   
       // Add Spatial Analyst extension to the license manager.  
       object v = null;  
       IExtensionManagerAdmin extensionManagerAdmin = new ExtensionManagerClass();  
       extensionManagerAdmin.AddExtension(pUid, ref v);  
   
       // Enable the license.  
       IExtensionManager extensionManager = (IExtensionManager)extensionManagerAdmin;  
       IExtension extension = extensionManager.FindExtension(pUid);  
       IExtensionConfig extensionConfig = (IExtensionConfig)extension;  
   
       if (extensionConfig.State != esriExtensionState.esriESUnavailable)  
       {  
         extensionConfig.State = esriExtensionState.esriESEnabled;  
       }  
       else  
       {  
         Console.WriteLine("No Spatial Analyst License available");  
       }

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