These are the EventArgs for the ContentsResized event, raised by the RichTextBox class when a contained element is resized. It allows you to retrieve the NewRectangle for the contents.

public class ContentsResizedEventArgs : EventArgs {
// Public Constructors
   public ContentsResizedEventArgs(System.Drawing.Rectangle newRectangle);
// Public Instance Properties
   public Rectangle NewRectangle{get; }
}

Hierarchy

System.Object System.EventArgs ContentsResizedEventArgs

Passed To

ContentsResizedEventHandler.{BeginInvoke(), Invoke()}, RichTextBox.OnContentsResized()