Put Highscore in each Scene with Saving

hi,
i have a problem with highscore saving, i create a game with many levels but when i play in each level , i always saw the same highscore. i don't know how to put and saving highscore for each levels in C#.
Would you help me plz? thank you

PS : sorry for my english , i'm french.

 

Use the playerprefs, saves /reads anything to registry at ease, one line of code;
saving: PlayerPrefs.SetInt("myscore", score);
loading: score=PlayerPrefs.GetInt("myscore");