How to access source features referenced by a network dataset

private ESRI.ArcGIS.Geodatabase.IFeature GetSourceFeature
    (ESRI.ArcGIS.Geodatabase.INetworkDataset networkDataset, int eid,
    ESRI.ArcGIS.Geodatabase.esriNetworkElementType elementType)
{
    // The element will be retrieved from the INetworkQuery interface on the network dataset.
    var netQuery = networkDataset as ESRI.ArcGIS.Geodatabase.INetworkQuery;

    // Create an empty element.
    ESRI.ArcGIS.Geodatabase.INetworkElement element = netQuery.CreateNetworkElement
        (elementType);

    // Populate the element base on the EID.
    switch (elementType)
    {
        case ESRI.ArcGIS.Geodatabase.esriNetworkElementType.esriNETEdge:
            netQuery.QueryEdge(eid,
                ESRI.ArcGIS.Geodatabase.esriNetworkEdgeDirection.esriNEDAlongDigitized, element as ESRI.ArcGIS.Geodatabase.INetworkEdge2);
            break;
        case ESRI.ArcGIS.Geodatabase.esriNetworkElementType.esriNETJunction:
            netQuery.QueryJunction(eid, element as
                ESRI.ArcGIS.Geodatabase.INetworkJunction);
            break;
        case ESRI.ArcGIS.Geodatabase.esriNetworkElementType.esriNETTurn:
            netQuery.QueryTurn(eid, element as ESRI.ArcGIS.Geodatabase.INetworkTurn);
            break;
    }

    // Get the source ID and OID from the element.
    int sourceID = element.SourceID;
    int sourceOID = element.OID;

    // Get the network source using the source ID of the element.
    ESRI.ArcGIS.Geodatabase.INetworkSource netSource = networkDataset.get_SourceByID
        (sourceID);

    // Get the network source as a feature class.
    var fClassContainer = networkDataset as
        ESRI.ArcGIS.Geodatabase.IFeatureClassContainer;
    ESRI.ArcGIS.Geodatabase.IFeatureClass sourceFClass =
        fClassContainer.get_ClassByName(netSource.Name);

    // Finally, get the source feature from the source feature class.
    return sourceFClass.GetFeature(sourceOID);
}

Private Function GetSourceFeature(ByVal networkDataset As ESRI.ArcGIS.Geodatabase.INetworkDataset, ByVal eid As Integer, ByVal elementType As ESRI.ArcGIS.Geodatabase.esriNetworkElementType) As ESRI.ArcGIS.Geodatabase.IFeature
    ' The element will be retrieved from the INetworkQuery interface on the network dataset.
    Dim netQuery = TryCast(networkDataset, ESRI.ArcGIS.Geodatabase.INetworkQuery)
    
    ' Create an empty element.
    Dim element As ESRI.ArcGIS.Geodatabase.INetworkElement = netQuery.CreateNetworkElement(elementType)
    
    ' Populate the element base on the EID.
    Select Case elementType
        Case ESRI.ArcGIS.Geodatabase.esriNetworkElementType.esriNETEdge
            netQuery.QueryEdge(eid, ESRI.ArcGIS.Geodatabase.esriNetworkEdgeDirection.esriNEDAlongDigitized, TryCast(element, ESRI.ArcGIS.Geodatabase.INetworkEdge2))
            Exit Select
        Case ESRI.ArcGIS.Geodatabase.esriNetworkElementType.esriNETJunction
            netQuery.QueryJunction(eid, TryCast(element, ESRI.ArcGIS.Geodatabase.INetworkJunction))
            Exit Select
        Case ESRI.ArcGIS.Geodatabase.esriNetworkElementType.esriNETTurn
            netQuery.QueryTurn(eid, TryCast(element, ESRI.ArcGIS.Geodatabase.INetworkTurn))
            Exit Select
    End Select
    
    ' Get the source ID and OID from the element.
    Dim sourceID As Integer = element.SourceID
    Dim sourceOID As Integer = element.OID
    
    ' Get the network source using the source ID of the element.
    Dim netSource As ESRI.ArcGIS.Geodatabase.INetworkSource = networkDataset.get_SourceByID(sourceID)
    
    ' Get the network source as a feature class.
    Dim fClassContainer = TryCast(networkDataset, ESRI.ArcGIS.Geodatabase.IFeatureClassContainer)
    Dim sourceFClass As ESRI.ArcGIS.Geodatabase.IFeatureClass = fClassContainer.get_ClassByName(netSource.Name)
    
    ' Finally, get the source feature from the source feature class.
    Return sourceFClass.GetFeature(sourceOID)
End Function