divide DataTable based on number of rows

I am trying to divide DataTable on the bases of rows. I have dataTable that get all the rows from DataBase. But i want to divide this datatable for example :

if i get 100000 rows count from Database. So First i want to show just 30000 rows, next i will show next 30000 rows, and then next 30000, and finally remaining 10000 rows. How i can do this operation using datatable. This is what i am trying : How i divide dataTable

DataTable _New_dt = New DataTable();
_New_dt = GetAllData();
if (_New_dt.Rows.Count >= Convert.ToInt32(ConfigurationManager.AppSettings["RecordLimit"]))
                            {
                                double rows = _New_dt.Rows.Count / 30000;
                                long SheetNumber =Convert.ToInt64( Math.Ceiling(rows));


                                using (XLWorkbook wb = new XLWorkbook())
                                {
                                    for (long i = 1; i <= SheetNumber; i++)
                                    {
                                        //wb.Worksheets.Add(dt, "Customers");
                                        DataTable dt = _New_dt.Clone();
                                    wb.Worksheets.Add(_New_dt.Select(), "WorkBook"+i);
                                    Response.Clear();
                                    Response.Buffer = true;
                                    Response.Charset = "";
                                    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                                    Response.AddHeader("content-disposition", "attachment;filename=MyDataSheet.xlsx");

                                    }
                                    using (MemoryStream MyMemoryStream = new MemoryStream())
                                    {
                                        wb.SaveAs(MyMemoryStream);
                                        MyMemoryStream.WriteTo(Response.OutputStream);
                                        Response.Flush();
                                        Response.End();
                                        //Response.Close();
                                    }
                                }
                            }