/// <summary>
/// Removes the frame at the specified index and frees all freeable resources associated with it.
/// </summary>
/// <param name="index">The zero-based index of the frame to remove.</param>
/// <exception cref="InvalidOperationException">Cannot remove last frame.</exception>
public void RemoveFrame(int index)
{
if (index == 0 && this.Count == 1)
{
throw new InvalidOperationException("Cannot remove last frame.");
}
ImageFrame <TPixel> frame = this.frames[index];
this.frames.RemoveAt(index);
frame.Dispose();
}