using Spire.Xls;

namespace ExcelPageBreak_XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化一个Wordbook类对象，并加载需要设置分页的Excel文档
            Workbook workbook = new Workbook();
            workbook.LoadFromFile("Sample.xlsx");

            //获取第一个工作表
            Worksheet sheet = workbook.Worksheets[0];

            //插入两个横向分页符(指定单元格上方插入分页)
            sheet.HPageBreaks.Add(sheet.Range["A11"]);
            sheet.HPageBreaks.Add(sheet.Range["A20"]);

            //插入一个纵向分页符（指定单元格左侧插入分页）
            //sheet.VPageBreaks.Add(sheet.Range["E1"]);

            //将视图设置为分页预览模式查看效果
            sheet.ViewMode = ViewMode.Preview;

            //保存并打开文档
            workbook.SaveToFile("AddPageBreak.xlsx", FileFormat.Version2010);
            System.Diagnostics.Process.Start("AddPageBreak.xlsx");
        }
    }
}

using Spire.Xls;

namespace DeletePageBreak_XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建一个Workbook类对象，并加载Excel文档
            Workbook workbook = new Workbook();
            workbook.LoadFromFile("sample.xlsx");

            //获取第一个worksheet
            Worksheet sheet = workbook.Worksheets[0];
            
            //删除所有横向分页
            sheet.HPageBreaks.Clear();

            //删除第一个横向分页
            //sheet.HPageBreaks.RemoveAt(0);

            //设置分页预览模式查看分页效果
            sheet.ViewMode = ViewMode.Preview;

            //保存并打开文档
            workbook.SaveToFile("删除分页1.xlsx",FileFormat.Version2010);
            System.Diagnostics.Process.Start("删除分页1.xlsx");
        }
    }
}