how would you deal with the error correction in your class room?

How would you deal with error correction in your class room?

First we need to think that we can learn by errors, long as not overlook thinking rather not commit again.
As a teacher ,everytime a student make a mistake, I have to let him know, but in a good manner, and explain him how it has to be,in a way that the student can see that I am interested that he learn.