Hi,Apologies for the delay in responding. You have spotted a gap in the API which we hope to resolve in a future release - but for now you have two options:#1. Use the Geoprocessor task in conjunction with a GPK based on a Python script which provides this functionality. This would be my preferred approach - using Arcpy and Python gives you massive flexibility. I've written up a sample of this and attached to the post.#2. Use the File Geodatabase API. This probably provides the functionality you require via a .NET API - but would be a hybrid solution of the ArcGIS Runtime SDK for WPF and the File GDB API.CheersMike