GPPointFileInfo\LicenseManager.cs
Creating a non-trival custom GP tool - inputs, outputs, and responding to environment settings
GPPointFileInfo\LicenseManager.cs
// Copyright 2008 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See use restrictions at <your ArcGIS install location>/developerkit/userestrictions.txt.
// 

using ESRI.ArcGIS.esriSystem;

namespace GPPointFileInfo
{
    public class LicenseManager : ILicenseManager
    {
        private ILicensedProducts _licensedProducts;

        public LicenseManager()
        {
            IAoInitialize aoInitialize = new AoInitializeClass();

            _licensedProducts = new LicensedProducts(aoInitialize);
        }

        public void Initialize()
        {
            _licensedProducts.Initialize();
        }

        public bool IsLicensed
        {
            get
            {
                return (_licensedProducts.IsLicensed);
            }
        }

        public void Shutdown()
        {
            _licensedProducts.Shutdown();
        }
    }
}