如何将纸张大小限制为c＃excel中的行数？

Question

I want to limit page size to 30 rows and rest of the data start from next page in excel. Currently it is set to Excel.XlPaperSize.xlPaperA4 . I tried page break with a condition

 if (row_no >= 30)
 {
 rng = (Excel.Range)xl_sheet.Range[xl_sheet.Cells[row_no, 1],xl_sheet.Cells[row_no, 1]];
 xl_sheet.HPageBreaks.Add(rng);
 row_no = 12;
 }

but the code above did not start from next page.
My code for page setup:

        xl_sheet.Select(Type.Missing);
        var ps = xl_sheet.PageSetup;
        ps.Orientation = Excel.XlPageOrientation.xlLandscape;
        ps.FitToPagesTall = false;
        ps.FitToPagesWide = 1;
        ps.Zoom = false;
        ps.PaperSize = Excel.XlPaperSize.xlPaperA4;
        ps.PrintTitleRows = "$1:$11";

Answer 1

I fixed the issue using following code and it working fine:

if (row_no% 30==0)
 {
 rng = (Excel.Range)xl_sheet.Range[xl_sheet.Cells[row_no, 1],xl_sheet.Cells[row_no, 1]];
 xl_sheet.HPageBreaks.Add(rng);

 }