GPPointFileInfo\GPEnvironmentManager.cs
Creating a non-trival custom GP tool - inputs, outputs, and responding to environment settings
GPPointFileInfo\GPEnvironmentManager.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.Geodatabase;

namespace GPPointFileInfo
{
    public class GPEnvironmentManager : GPPointFileInfo.IGPEnvironmentManager
    {
        private ESRI.ArcGIS.Geoprocessing.IGPEnvironmentManager _gpEnvironmentManager;

        public GPEnvironmentManager(ESRI.ArcGIS.Geoprocessing.IGPEnvironmentManager gpEnvironmentManager)
        {
            _gpEnvironmentManager = gpEnvironmentManager;
        }

        public IGPValue GetGPValue(string environmentName)
        {
            IGPValue gpValue;

            ESRI.ArcGIS.Geoprocessing.IGPEnvironment gpEnvironment = _gpEnvironmentManager.FindEnvironment(environmentName);

            gpValue = gpEnvironment.Value;

            return gpValue;
        }
    }
}