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);
}