Why one works and the other doesn't ?

Questions & Answers
1

Why is 1 different from 2 ?

public void Function(int newCount)
{
    IEnumerable<Note> temp = notes.Take(newCount).ToArray();
    notes.Clear();
    notes.AddRange(temp);
}

  public void Function(int newCount)
    {
        IEnumerable<Note> temp = notes.Take(newCount);
        notes.Clear();
        notes.AddRange(temp);
    }

I know that 1 is ICollection 2 is just IEnumerable, but why doesn’t 2 work?

2

Clear is a method on List and does not exist on IEnumerable (I am pretty sure not even with extension methods)