Clientside CSharp FAQ

Can I reference DLLs

No you cannot. The cs_packages folder will only compile .cs files

Is it possible to use RAGE serverside JS with clientside C#

Yes

How to stop the player losing hp when running?

This is due to player stamina hitting zero, resulting in hp being lost. Use the method RAGE.Game.Player.RestorePlayerStamina(1.0F); on Tick event