Please refer to the .NET Development sections in the appropriate GX Developer version:
Release Notes
Version 2024.1
Version 2023.2
Version 2023.1
Version 2022.2
Version 2022.1
Version 2021.2
Version 9.10
Version 9.9
Version 9.8
Version 9.7
Version 9.6
Version 9.5
Version 9.4
Version 9.3
Version 9.2
Version 9.1
Version 9.0
geosoft.gxapigeosoft.gxpy