public static bool CreatePerson(string firstName, 
                             string lastName,
                             string enrollmentDate, 
                             string hireDate = null,
                             string discriminator = "Student")
 {
     PersonManager pm = new PersonManager();
     return pm.CreatePerson(firstName,
                     lastName,
                     null,
                     enrollmentDate,
                     hireDate,
                     discriminator);
 }
 public static bool CreatePerson2(string firstName,
                             string lastName,
                             string hireDate,
                             string officeLocation,
                             string enrollmentDate = null,
                             string discriminator = "Instructor")
 {
     PersonManager pm = new PersonManager();
     return pm.CreatePerson(firstName,
                     lastName,
                     officeLocation,
                     enrollmentDate,
                     hireDate,
                     discriminator);
 }
 // FROM HERE THE PRACTICE
 public static Person GetPerson(string firstName,string lastName)
 {
     PersonManager pm = new PersonManager();
     return pm.GetPerson(firstName, lastName);
 }
 public static bool DeletePerson(string firstName, string lastName)
 {
     PersonManager pm = new PersonManager();
     return pm.DeletePerson(firstName, lastName);
 }