I am trying to programmatically delete telemetry data in Azure IoT Central/IoT Hub using CSharp. Is there any api's to do this without deleting the devices?
The device telemetry data are ingested into the underlying streaming resource such as the Event Hubs and they are stayed there based on the retention policy, see more details here.
Note, that the events can't be deleted explicitly from the Event Hubs and the shortest possible retention period is 1 day.