public School()
{
ChildList = new List <SchoolChild>();
subjects = new Subjects();
}
private School(SerializationInfo info, StreamingContext context)
{
ChildList = info.GetValue(nameof(ChildList), typeof(List <SchoolChild>)) as List <SchoolChild>;
subjects = (Subjects)info.GetValue(nameof(subjects), typeof(Subjects));
}