public void AddEmployee(Employee emp)
 {
     if (emp != null)
     {
         using (Model.Practico_EntregableEntities en = new Model.Practico_EntregableEntities())
         {
             if (emp.GetType().Name == "PartTimeEmployee")
             {
                 PartTimeEmployee       Pte = (PartTimeEmployee)emp;
                 Model.PartTimeEmployee obj = new Model.PartTimeEmployee()
                 {
                     Name       = Pte.Name,
                     StartDate  = Pte.StartDate,
                     HourlyRate = Pte.HourlyRate
                 };
                 en.Employee.Add(obj);
                 en.SaveChanges();
             }
             else
             {
                 FullTimeEmployee       Fte = (FullTimeEmployee)emp;
                 Model.FullTimeEmployee obj = new Model.FullTimeEmployee()
                 {
                     Name      = Fte.Name,
                     StartDate = Fte.StartDate,
                     Salary    = Fte.Salary
                 };
                 en.Employee.Add(obj);
                 en.SaveChanges();
             }
         }
     }
 }
 public void DeleteEmployee(int id)
 {
     using (Model.Practico_EntregableEntities en = new Model.Practico_EntregableEntities())
     {
         en.Employee.Remove(en.Employee.FirstOrDefault(x => x.EmployeeId == id));
         en.SaveChanges();
     }
 }
 public void UpdateEmployee(Employee emp)
 {
     if (emp != null)
     {
         using (Model.Practico_EntregableEntities en = new Model.Practico_EntregableEntities())
         {
             Model.Employee e = en.Employee.FirstOrDefault(x => x.EmployeeId == emp.Id);
             e.Name      = emp.Name;
             e.StartDate = emp.StartDate;
             if (emp.GetType().Name == "PartTimeEmployee")
             {
                 Model.PartTimeEmployee Pte = (Model.PartTimeEmployee)e;
                 Pte.HourlyRate = ((PartTimeEmployee)emp).HourlyRate;
             }
             else
             {
                 Model.FullTimeEmployee Fte = (Model.FullTimeEmployee)e;
                 Fte.Salary = ((FullTimeEmployee)emp).Salary;
             }
             en.SaveChanges();
         }
     }
 }