System.Object
   C1.C1Pdf.PdfDocumentInfo
   C1.C1Pdf.PdfFieldBase
      C1.C1Pdf.PdfPushButton
      C1.C1Pdf.PdfRadioCheckBase
         C1.C1Pdf.PdfCheckBox
         C1.C1Pdf.PdfRadioButton
      C1.C1Pdf.PdfSignature
      C1.C1Pdf.PdfTextFieldBase
         C1.C1Pdf.PdfComboListBase
            C1.C1Pdf.PdfComboBox
            C1.C1Pdf.PdfListBox
         C1.C1Pdf.PdfTextBox
   C1.C1Pdf.PdfNoteBase
      C1.C1Pdf.PdfLineNote
      C1.C1Pdf.PdfRectNote
         C1.C1Pdf.PdfSquareNote
            C1.C1Pdf.PdfCircleNote
         C1.C1Pdf.PdfTextNote
   C1.C1Pdf.PdfPushButton.Action
   C1.C1Pdf.PdfPushButton.ActionCollection
   C1.C1Pdf.PdfSecurity
   C1.C1Pdf.PdfViewerPreferences
   C1.C1Pdf.Reader.PdfObjectWrapper
      C1.C1Pdf.PdfPage
   C1.C1Pdf.Strings
   C1.C1Pdf.Strings.Errors
   System.Collections.Generic.List<T>
      C1.C1Pdf.PdfPageCollection
   System.MarshalByRefObject
      System.ComponentModel.Component
         C1.C1Pdf.C1PdfDocumentBase
            C1.C1Pdf.C1PdfDocument

Reference

C1.C1Pdf.4.5.2 Assembly