public void AddEmployee()
 {
     using (var context = new Caz5Context())
     {
         var fte = new FullTimeEmployee
         {
             FirstName = "Jane",
             LastName  =
                 "Doe",
             Salary = 71500M
         };
         context.Employees.Add(fte);
         fte = new FullTimeEmployee
         {
             FirstName = "John",
             LastName  = "Smith",
             Salary    = 62500M
         };
         context.Employees.Add(fte);
         var hourly = new HourlyEmployee
         {
             FirstName = "Tom",
             LastName  =
                 "Jones",
             Wage = 8.75M
         };
         context.Employees.Add(hourly);
         context.SaveChanges();
     }
 }