// Create a document.

    using( var document = DocX.Create( "SetPageOrientations.docx" ) )

    {

      // Section 1

      // Set Page Orientation to Landscape.

      document.Sections[ 0 ].PageLayout.Orientation = Orientation.Landscape;

      // Add paragraphs in section 1.

      document.InsertParagraph( "This is the first page in Landscape format." );

      // Add a section break as a page break to end section 1.

      // The new section properties will be based on last section properties.

      document.InsertSectionPageBreak();

      // Section 2

      // Set Page Orientation to Portrait.

      document.Sections[ 1 ].PageLayout.Orientation = Orientation.Portrait;

      // Add paragraphs in section 2.

      document.InsertParagraph( "This is the second page in Portrait format." );

      // Add a section break as a page break to end section 2.

      // The new section properties will be based on last section properties.

      document.InsertSectionPageBreak();

      // Section 3

      // Set Page Orientation to Landscape.

      document.Sections[ 2 ].PageLayout.Orientation = Orientation.Landscape;

      // Add paragraphs in section 3.

      document.InsertParagraph( "This is the third page in Landscape format." );

      document.Save();

    }