iTextSharp.text.pdf.RandomAccessFileOrArray.PushBack C# (CSharp) Метод

        public void PushBack(byte b)
        {
            back = b;
            isBack = true;
        }

 virtual public void BackOnePosition(int ch)
 {
     if (ch != -1)
     {
         file.PushBack((byte)ch);
     }
 }