How to Convert Yogesh.ExcelXmlWorkBook To byte Array?

Question

Hello I Have A Method That Converts Sql Data Reader To Yogesh.ExcelXmlWorkBook And Save It Into An Specified Folder,But I Want To Store It Directly To Database With Binary Format,Could You Please Help Me How Can I Convert It to Byte Array And Save It Directly Into Database? Thanks A Lot.

public static string ExportToXML(int reportCode, SqlDataReader sqlReader, bool hasHeader)
        {
            string randomName = "";
            try
            {
                if (reportDefaultPath == "")
                {
                   // reportDefaultPath = HttpContext.Current.Server.MapPath("~/Files/ReportResult/{0}");
                    reportDefaultPath = System.Configuration.ConfigurationSettings.AppSettings["PicPath"].ToString() + "\\ReportResult\\{0}";   
                }

                ExcelXmlWorkbook book = new ExcelXmlWorkbook();
                book.Properties.Author = "Raahabr";
                Yogesh.ExcelXml.Worksheet sheet = book[0];
                sheet.Name = "";
                sheet.FreezeTopRows = 4;
              //  sheet.Border.LineStyle = Yogesh.ExcelXml.Borderline.Continuous;
              //  sheet.Border.Sides = BorderSides.Bottom;

                int startCol = 3;
                int currentRow = 3;

                int colCount = sqlReader.FieldCount;
                if (hasHeader)
                {
                    ReportBOL rbol = new ReportBOL();
                    Dictionary<string, string> cNames = rbol.getColumnNames(reportCode);

                    for (int i = 0; i < colCount; i++)
                    {
                        string head = sqlReader.GetName(i);
                        string value = (cNames.ContainsKey(head)) ? cNames[head] : head;
                        if (value.ToString() == "")
                            value = head;
                        sheet[currentRow + i, currentRow].Value = value;
                        sheet[currentRow + i, currentRow].Border.LineStyle = Borderline.Continuous;
                        sheet[currentRow + i, currentRow].Border.Sides = BorderSides.All;
                    }
                }
                currentRow++;

                if (sqlReader.HasRows)
                {
                    while (sqlReader.Read())
                    {
                        for (int i = 0; i < colCount; i++)
                        {
                            sheet[startCol + i, currentRow].Value = sqlReader[i].ToString();
                            sheet[startCol + i, currentRow].Border.LineStyle = Borderline.Continuous;
                            sheet[startCol + i, currentRow].Border.Sides = BorderSides.All;
                        }
                        currentRow++;
                    }
                }
                randomName = getRandomName();
                book.Export(string.Format(reportDefaultPath, randomName));
                var tools = new Tools();
                book.DeleteSheet(0);
            }
            catch (Exception ex)
            {
               // System.IO.File.WriteAllText(HttpContext.Current.Server.MapPath("~/err.txt"), randomName + ";" + reportDefaultPath + "\r\n" + ex.Message + "\r" + ex.StackTrace);
            }
            finally
            {
                sqlReader.Close();
                sqlReader.Dispose();
            }
            return randomName;
        }```