public void Remove(int offset, int length) { if (readOnly) { return; } OnDocumentAboutToBeChanged(new DocumentEventArgs(this, offset, length)); undoStack.Push(new UndoableDelete(this, offset, GetText(offset, length))); textBufferStrategy.Remove(offset, length); lineTrackingStrategy.Remove(offset, length); OnDocumentChanged(new DocumentEventArgs(this, offset, length)); }