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the difference between projecting data and changing a dataset's spatial reference

Question asked by tedrakel on May 21, 2013
Latest reply on May 23, 2013 by tedrakel
Is there a difference between

1) projecting the data in a feature dataset using arc toolbox->data management tools->Projections and Transformations->Batch Project
2) changing the spatial reference on a feature dataset

Also, does anyone know a way to reproject data using something other that arc toolbox or the python arcpy.project_management method?  Perhaps something in c#.