public class FeatureClassToken : TableToken 

{
  // Must be called within QueuedTask.Run
  void CreateFeatureDatasetWithFeatureClassSnippet(Geodatabase geodatabase)
  {
    // Creating a FeatureDataset named as 'Parcel_Information' and a FeatureClass with name 'Parcels' in one operation
    string featureDatasetName = "Parcel_Information";
    string featureClassName = "Parcels";

    SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

    // Create a FeatureDataset token
    FeatureDatasetDescription featureDatasetDescription = new FeatureDatasetDescription(featureDatasetName, SpatialReferences.WGS84);
    FeatureDatasetToken featureDatasetToken = schemaBuilder.Create(featureDatasetDescription);

    // Create a FeatureClass description
    FeatureClassDescription featureClassDescription = new FeatureClassDescription(featureClassName,
      new List<FieldDescription>()
      {
          new FieldDescription("Id", FieldType.Integer),
          new FieldDescription("Address", FieldType.String)
      },
      new ShapeDescription(GeometryType.Point, SpatialReferences.WGS84));

    // Create a FeatureClass inside a FeatureDataset
    FeatureClassToken featureClassToken = schemaBuilder.Create(
      new FeatureDatasetDescription(featureDatasetToken),
      featureClassDescription);

    // Build status
    bool buildStatus = schemaBuilder.Build();

    // Build errors
    if (!buildStatus)
    {
      IReadOnlyList<string> errors = schemaBuilder.ErrorMessages;
    }
  }
}