// Create a document.

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

    {

      // Different odd and even pages headers/footers.

      document.DifferentOddAndEvenPages = true;

      // Section 1

      // Set Page parameters for section 1

      // Set footers for section 1.

      document.Sections[ 0 ].AddFooters();

      document.Sections[ 0 ].DifferentFirstPage = true;

      var footers = document.Sections[ 0 ].Footers;

      footers.First.InsertParagraph( "This is the First page footer." );

      footers.Even.InsertParagraph( "This is the Even page footer." );

      footers.Odd.InsertParagraph( "This is the Odd page footer." );

      // Add paragraphs and page breaks in section 1.

      document.InsertParagraph( "FIRST" ).InsertPageBreakAfterSelf();

      document.InsertParagraph( "SECOND" ).InsertPageBreakAfterSelf();

      document.InsertParagraph( "THIRD" );

      // 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 parameters for section 2

      document.Sections[ 1 ].PageWidth = 200f;

      document.Sections[ 1 ].PageHeight = 300f;

      // Set footers for section 2.

      document.Sections[ 1 ].AddFooters();

      document.Sections[ 1 ].DifferentFirstPage = true;

      var footers2 = document.Sections[ 1 ].Footers;

      footers2.First.InsertParagraph( "This is the First page footer of Section 2." );

      footers2.Odd.InsertParagraph( "This is the Odd page footer of Section 2." );

      footers2.Even.InsertParagraph( "This is the Even page footer of Section 2." );

      // Add paragraphs and page breaks in section 2.

      document.InsertParagraph( "FOURTH" ).InsertPageBreakAfterSelf();

      document.InsertParagraph( "FIFTH" ).InsertPageBreakAfterSelf();

      document.InsertParagraph( "SIXTH" );

      // 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 parameters for section 3

      document.Sections[ 2 ].PageWidth = 595f;

      document.Sections[ 2 ].PageHeight = 841f;

      document.Sections[ 2 ].MarginTop = 300f;

      document.Sections[ 2 ].MarginFooter = 120f;

      // Set footers for section 3.

      document.Sections[ 2 ].AddFooters();

      document.Sections[ 2 ].DifferentFirstPage = true;

      var footers3 = document.Sections[ 2 ].Footers;

      footers3.First.InsertParagraph( "This is the First page footer of Section 3." );

      footers3.Odd.InsertParagraph( "This is the Odd page footer of Section 3." );

      footers3.Even.InsertParagraph( "This is the Even page footer of Section 3." );

      // Add paragraphs and page breaks in section 3.

      document.InsertParagraph( "SEVENTH" ).InsertPageBreakAfterSelf();

      document.InsertParagraph( "EIGHTH" ).InsertPageBreakAfterSelf();

      document.InsertParagraph( "NINETH" );

      // Get the different sections.

      var sections = document.GetSections();

      document.Save();

    }