Sets or returns an int that represents the page height for this section in twips. One twip = (1/20 pt) or (1/1440 in)

public int PageHeight{ get; set; }
Public Property PageHeight() As Integer

Page height may not be smaller than .1" (144 twips) or larger than 22" (31680 twips). Values beyond these will be automatically adjusted.

MS Word equivalent: File menu > Page Setup... > Paper tab > Paper size: section > Height: -- (Make sure Apply to: This section is selected)

          //--- Return PageHeight
          int pageHeight = oSection.PageHeight;

          //--- Set PageHeight to 11 inches
          oSection.PageHeight = 15840;
        
          '--- Return PageHeight
          Dim pageHeight As Integer = oSection.PageHeight

          '--- Set PageHeight to 11 inches
          oSection.PageHeight = 15840