I've been using Prettier during a time and with JavaScript works perfect.
But since I also started to work with C#, I don't know how to setup VSC for still use Prettier for JavaScript and another plugin for C# formatting.
Edit: if I disable Prettier as default editor it works. But I can't disable only for C#. This setting doesn't works:
"prettier.disableLanguages": [ "csharp", "cs" ]