Programing in vb. (Employee Class)Create a class called Employee that includes three pieces of information as instance variables-a first name(type String),a last name(type String) and a monthly salary (type Integer). Your class should have a constructor that initializes the three instance variables. Provide a property for each instance variable. The property for the monthly salary should ensure that its value remains positive-if an attempt is made to assign a negative value,throw an exception. Write an application that demonstrates class Employee's capabilities. Create two Employee objects and display each object's yearly salary. THEN give each Employee a 10% raise and display each employee's yearly salary again