public string ShowEmpl(string firstName, string secondName)
 {
     Employee emp = new Employee(firstName, secondName);
     if (_listEmpl.Contains(emp))
     {
         return _listEmpl[FindEmp(emp) - 1].ToString();
     }
     else
     {
         return firstName + " " + secondName + " отсутствует в базе, возможно стоит проверить регистр";
     }
 }
 public bool DelEmpl(string firstName, string secondName)
 {
     Employee emp = new Employee(firstName, secondName);
     if (_listEmpl.Contains(emp))
     {
         _listEmpl.Remove(emp);
         return true;
     }
     else
     {
         return false;
     }
 }
 private int FindEmp(Employee emp)
 {
     for (int i = 0; i < _listEmpl.Count; i++)
     {
         if (_listEmpl[i].Equals(emp))
         {
             return i + 1;
         }
     }
     return 0;
 }