FeatureClass Copy

http://edndoc.esri.com/arcobjects/9.2/NET/c45379b5-fbf2-405c-9a36-ea6690f295b2.htm

Method	What is transferred	Works with query filter	Crosses data sources	Works with edit session	ArcGIS Desktop/ ArcGIS Engine
IFeatureDataConverter[2]	Single table, feature class, or feature dataset	True	True	False	Both
IGeoDBDataTransfer	Multiple tables, feature classes, and/or feature datasets, and domains from geodatabases	False	False	False	Both
IExportOperation (GeodatabaseUI)	Single table or feature class	True	True	False	ArcGIS Desktop
IDataset.Copy	Single dataset from a file-based data source	False	False	False	Both
IWorkspaceFactory (Copy and Move methods)	Local (personal or file) geodatabase, or an SDE connection file	False	False	False	Both
IGdbXmlExport and IGdbXmlImport (GeoDatabaseDistributed)	Entire workspace (schema, data optional), one or more datasets (schema, data optional), or a record set *	False	False	False	Both
IObjectLoader (EditorExt)	Individual rows from one dataset to another existing dataset	True	True	True	ArcGIS Desktop
* The IGdbXmlExport and IGdbXmlImport interfaces indirectly transfer data between geodatabases by first converting the dataset schema (and, optionally, the data) to Extensible Markup Language (XML), then from XML back to its original form.