I'm new in programming using arcobjects, trying to build a desktop arcmap 10.5 add-in using C#, one of the main issues i'm not able to solve is converting (easting/northing) to (latitude/longitude) using same "projected" SpatialReference, that means that the conversion should use the ellipsoid information stored in the same projected spatial reference assigned to the feature.
Solved! Go to Solution.
If you have the spatial reference, get the ProjectedCoordinateSystem, then the GeographicCoordinateSystem from that. Use the GCS as the target/output coordinate system.