The tostring, equals, and gethashcode methods are available to all objects because they are members of the System.Object class, which all objects inherit.
The tostring() method can be defined as the method used to get a string object that represents the value of a number object.
The equals() method compares two strings, and returns true if the strings are equal, and false if not.
The main difference between the equals() method and == operator is that one is a method, and the other is the operator.
The GetHashCode method provides this hash code for algorithms that need quick checks of object equality.
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