Set page break in Excel

VSTO
Spire.XLS
Download Sample Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Excel;

namespace VSTO
{
    public partial class ThisAddIn
    {
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            //Open the workbook file
            Excel.Application excelApp = Application;
            Excel.Workbook workbook = excelApp.Application.Workbooks.Open("C:\\Sample.xlsx");           

            //Get the active worksheet
            Excel.Worksheet sheet = workbook.ActiveSheet;

            //Set page break horizontally
            Excel.Range range1 = sheet.get_Range("A7");
            sheet.HPageBreaks.Add(range1);

            //Set page break vertically
            Excel.Range range2 = sheet.get_Range("B7");           
            sheet.VPageBreaks.Add(range2);

            //Save the file
            workbook.SaveAs("PageBreakExcel.xlsx");       
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }
        
        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Spire.Xls;

namespace Spire.XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //Load Document
            Workbook workbook = new Workbook();
            workbook.LoadFromFile("C:\\Sample.xlsx");

            //Get the first sheet
            Worksheet sheet = workbook.Worksheets[0];

            //Set page break horizontally
            CellRange range1 = sheet.Range["A7"];
            sheet.HPageBreaks.Add(range1);

            //Set page break vertically
            CellRange range2 = sheet.Range["B7"];
            sheet.VPageBreaks.Add(range2);

            //Set the view mode of sheet
            sheet.ViewMode = ViewMode.Preview;

            //Save and Launch
            workbook.SaveToFile("PageBreakExcel.xlsx", ExcelVersion.Version2013);
            System.Diagnostics.Process.Start("PageBreakExcel.xlsx");
        }
    }
}

PageBreak.zip