public bool RemoveCourse(Course c)
{
if (c == null)
throw new NullReferenceException();
string name = c.Name;
if (_listcourse.ContainsKey(name))
{
_listcourse.Remove(name);
return true;
}
else
{
return false;
}
}
// COURSE
public Course AddCourse(string name)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new NullReferenceException();
}
if (_listcourse.ContainsKey(name))
{
throw new ArgumentException();
}
Course c = new Course(name, this);
_listcourse.Add(name, c);
return c;
}