Exercise 4.11 (Employee Class)

 Create a class called Employee that includes three pieces of information as either instance variables or auto-implemented properties—a first name (type string), a last name (type string) and a monthly salary (decimal). Your class should have a constructor that initializes the three values. Provide a property with a get and set accessor for any instance variables. If the monthly salary is negative, the set accessor should leave the instance variable unchanged. Write a test app named EmployeeTest 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.

Please use C# and submit as a zip file.