/// <summary>
/// Adds the element to the end of the collection.
/// </summary>
/// <param name="item">The element to be added.</param>
public void Add(OptionalContentGroupItem item)
{
if (item == null)
{
throw new ArgumentNullException();
}
_items.Add(item);
_array.AddItem(item.GetObject());
}
/// <summary>
/// Inserts an element at the specified index to the collection.
/// </summary>
/// <param name="index" href="http://msdn.microsoft.com/en-us/library/system.int32.aspx">The zero-based index at which the element is to be inserted.</param>
/// <param name="item">The element to insert.</param>
public void Insert(int index, OptionalContentGroupItem item)
{
if (item == null)
{
throw new ArgumentNullException();
}
if (index < 0 || index > Count)
{
throw new IndexOutOfRangeException();
}
_items.Insert(index, item);
_array.Insert(index, item.GetObject());
}