The source code for OpenEVSE WiFi is here:
https://github.com/OpenEVSE/ESP32_WiFi_V4.x
OpenEVSE can be controlled by OCPP 1.6J, MQTT or http you should be able to use any of these protocols in C#.
Here is the OpenEVSE API.
https://openevse.stoplight.io/docs/openevse-wifi-v4/6e3b6e2f1b976-open-evse-wi-fi-esp-32-gateway-v4
Here is the OCPP source:
MUGEON KIM
Is there any to use openEVSE IN C#? IF possible, please tell me how to use it in detail.Please provide example code or data.