private bool FilterReports(Employee entity)
 {
     return (entity.ManagerID == this.EmployeeID);
 }
 private void DetachReports(Employee entity)
 {
     entity.Manager = null;
 }
 private bool FilterManager(Employee entity)
 {
     return (entity.EmployeeID == this.ManagerID);
 }
 private void AttachReports(Employee entity)
 {
     entity.Manager = this;
 }
 private bool FilterEmployee(Employee entity)
 {
     return (entity.EmployeeID == this.EmployeeID);
 }