//Classroom
public Classroom AddClassroom(string name)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new NullReferenceException();
}
if (_listclassroom.ContainsKey(name))
{
throw new ArgumentException();
}
Classroom classroom = new Classroom(name, this);
_listclassroom.Add(name, classroom);
return classroom;
}
public bool RemoveClassroom(Classroom c)
{
if (c == null)
throw new ArgumentException();
string name = c.Name;
if (_listpromotion.ContainsKey(name))
{
_listpromotion.Remove(name);
return true;
}
else
{
return false;
}
}
