public PersonEmpKey(PersonEmployment personEmployment)
 {
     _name    = personEmployment.Name;
     _company = personEmployment.Company;
 }
 protected bool Equals(PersonEmployment other)
 {
     return(string.Equals(Name, other.Name) && string.Equals(Company, other.Company));
 }
 protected bool Equals(PersonEmployment other)
 {
     return(string.Equals(_name, other._name) && string.Equals(_company, other._company));
 }