Difference between Equals/equals and == operator?

Question

What is the difference between a == b and a.Equals(b)?

Answer 1

a == b returns true if the references contain the same value, i.e., they point to the same object, or they are both null.

The equals() method can be overridden to compare objects. For example, on Strings, the method returns true if the strings contain the same string, even if they are different string objects. You can do similar things with your own objects.

o.equals() will throw an exception if o is a null reference.