How to create geometric networks within a geodatabase

public void CreateGeometricNetwork(IWorkspace workspace, IFeatureDatasetName

    featureDatasetName)

{

    // Create a network loader.

    INetworkLoader2 networkLoader2 = new NetworkLoaderClass();



    // Set the network name.

    networkLoader2.NetworkName = "Water_Net";



    // Set the network type.

    networkLoader2.NetworkType = esriNetworkType.esriNTUtilityNetwork;



    // Set the containing feature dataset.

    networkLoader2.FeatureDatasetName = (IDatasetName)featureDatasetName;



    // Add the two classes to the network.

    if (networkLoader2.CanUseFeatureClass("Distribmains") ==

        esriNetworkLoaderFeatureClassCheck.esriNLFCCValid)

    {

        networkLoader2.AddFeatureClass("Distribmains",

            esriFeatureType.esriFTComplexEdge, null, false);

    }



    if (networkLoader2.CanUseFeatureClass("Tanks") ==

        esriNetworkLoaderFeatureClassCheck.esriNLFCCValid)

    {

        networkLoader2.AddFeatureClass("Tanks", esriFeatureType.esriFTSimpleJunction,

            null, false);

    }



    // Set the enabled field for the distribmains class.

    INetworkLoaderProps networkLoaderProps = (INetworkLoaderProps)networkLoader2;

    String defaultEnabledFieldName = networkLoaderProps.DefaultEnabledField;

    esriNetworkLoaderFieldCheck enabledFieldCheck =

        networkLoader2.CheckEnabledDisabledField("Tanks", defaultEnabledFieldName);

    switch (enabledFieldCheck)

    {

        case esriNetworkLoaderFieldCheck.esriNLFCValid:

        case esriNetworkLoaderFieldCheck.esriNLFCNotFound:

            networkLoader2.PutEnabledDisabledFieldName("Tanks",

                defaultEnabledFieldName);

            break;

        default:

            Console.WriteLine(

                "The field {0} could not be used as an enabled/disabled field.",

                defaultEnabledFieldName);

            break;

    }



    networkLoader2.PreserveEnabledValues = true;



    // Set the ancillary role field for the tanks class.

    String defaultAncillaryRoleFieldName =

        networkLoaderProps.DefaultAncillaryRoleField;

    esriNetworkLoaderFieldCheck ancillaryRoleFieldCheck =

        networkLoader2.CheckAncillaryRoleField("Tanks",

        defaultAncillaryRoleFieldName);

    switch (ancillaryRoleFieldCheck)

    {

        case esriNetworkLoaderFieldCheck.esriNLFCValid:

        case esriNetworkLoaderFieldCheck.esriNLFCNotFound:

            networkLoader2.PutAncillaryRole("Tanks",

                esriNetworkClassAncillaryRole.esriNCARSourceSink,

                defaultAncillaryRoleFieldName);

            break;

        default:

            Console.WriteLine(

                "The field {0} could not be used as an ancillary role field.",

                defaultAncillaryRoleFieldName);

            break;

    }



    // If the geodatabase is an SDE GDB, set the configuration keyword.

    if (workspace.Type == esriWorkspaceType.esriRemoteDatabaseWorkspace)

    {

        networkLoader2.ConfigurationKeyword = "Network_Defaults";

    }



    // Set the snap tolerance for the network.

    networkLoader2.SnapTolerance = networkLoader2.MinSnapTolerance;



    // Add a weight with a double type to the network.

    networkLoader2.AddWeight("MainWeight", esriWeightType.esriWTDouble, 0);



    // For weights of type esriWTBitGate, the BitGateSize parameter should be set:

    networkLoader2.AddWeight("WTBitGateEx", esriWeightType.esriWTBitGate, 5);



    // Associate the MainWeight weight with the DIAMETER field of Distribmains.

    networkLoader2.AddWeightAssociation("MainWeight", "Distribmains", "DIAMETER");



    // Load the network.

    networkLoader2.LoadNetwork();



    // Get the name of the network's error table.

    String errorTableName = networkLoader2.ErrorTableName;



    // Display the number of invalid features in the Distribmains class.

    int numInvalidFeatures = networkLoader2.get_NumInvalidFeatures("Distribmains");

    Console.WriteLine("Distribmains contains {0} invalid features.",

        numInvalidFeatures);



    // Display the number of invalid features in the network.

    int totalNumInvalidFeatures = networkLoader2.TotalNumInvalidFeatures;

    Console.WriteLine("The network contains {0} invalid features.",

        totalNumInvalidFeatures);

}