Array.Sort() and Sort()

Question

When we sort an Array we use Array .Sort() and when we sort ArrayList we use Sort(). Please explain the reason. Example is given below.
eg:-
Employee[] empArray = new Employee[] { new Employee(333, 12.50), new Employee(111, 14.75), new Employee(222, 22.35) };
Array.Sort(empArray);
eg:-
ArrayList people = new ArrayList(); //this requires using System.Collections;
people.Add(new Person("John", "Doe", 84));
people.Add(new Person("Abby", "Normal", 25));
people.Add(new Person("Jane", "Doe", 76));
people.Sort();

Vulpes · Accepted Answer

The difference is that the ArrayList class has an instance Sort() method, so you apply this to an ArrayList object i.e. people in your example.
However, the Array class (from which all arrays derive) has a static Sort method and (for the overload you're using) you pass the array object (empArray in your example) as the single parameter of this method.

Answer

Thank you for your explanation.