ye, some1 already prolly mentioned here - just accelerate slightly and steer counter-wise with final position as wheels straight, NEVER BRAKE VIOLENTLY when you feel skidding. I know it may feel psychologically wrong thing to do - but trust me, we all went trough that and that's the proper way of advanced driving and getting out of dangerous skid situation. Look for advanced or aggressive driving videos - amazing stuff - the more you know the better you are out there on the road
BTW - Good to see you manage not to hit anything or damage yourself
I remember once with my 1986 W124 300E when i turned 50mph into wet pothole and had to manage my babe (she had no ABS or EPS
)) back to safety...
You were going to fast with C class - trust me you you may want to go somehow fast with maybe S classe, but not your C240 - its just not made or optimized for fast velocity.