/// <summary>
/// Removes the item at the specified index.
/// </summary>
/// <param name="index">The zero-based index of the item to remove.</param>
/// <exception cref="T:System.ArgumentOutOfRangeException">
/// <paramref name="index"/> is not a valid index in this list.
/// </exception>
/// <exception cref="T:System.NotSupportedException">
/// This list is read-only.
/// </exception>
public virtual void RemoveAt(int index)
{
ListHelper.CheckExistingIndexArgument(this.Count, index);
this.DoRemoveAt(index);
}
/// <summary>
/// Inserts an item to this list at the specified index.
/// </summary>
/// <param name="index">The zero-based index at which <paramref name="item"/> should be inserted.</param>
/// <param name="item">The object to insert into this list.</param>
/// <exception cref="T:System.ArgumentOutOfRangeException">
/// <paramref name="index"/> is not a valid index in this list.
/// </exception>
/// <exception cref="T:System.NotSupportedException">
/// This list is read-only.
/// </exception>
public virtual void Insert(int index, T item)
{
ListHelper.CheckNewIndexArgument(this.Count, index);
this.DoInsert(index, item);
}