public override void Map(IMapDataSource source, object sourceObject, int sourceIndex, IMapDataDestination destination, object destinationObject, int destinationIndex) { if(source.IsNull(sourceObject, sourceIndex)) { destination.SetNullableFloat(destinationObject, destinationIndex, null); } else { destination.SetNullableFloat(destinationObject, destinationIndex, Convert.ToSingle(source.GetString(sourceObject, sourceIndex))); } }