public void addNanny(Nanny nanny)
{
if (DataSource.nannyList.Exists(nl => nl.nannyId == nanny.nannyId))
{
throw new Exception("Nanny is already exist in system");
}
DataSource.nannyList.Add(nanny.duplicate());
}
public void updateNanny(Nanny nanny)
{
int nanindex = DataSource.nannyList.FindIndex(nl => nl.nannyId == nanny.nannyId);
if (nanindex == -1)
{
throw new Exception("Nanny is not exist in system");
}
DataSource.nannyList[nanindex] = nanny.duplicate();
}