private void RunExportToExcelML(string fileName, ref bool openExportFile)
        {
            ExportToExcelML excelExporter = new ExportToExcelML(this.radGridView1)
            {
                SheetName = "Essai",
                SummariesExportOption = SummariesOption.ExportAll,
                SheetMaxRows = ExcelMaxRows._65536,
                ExportVisualSettings =true,
                
                
                
            };

            try
            {
                excelExporter.RunExport(fileName);

                RadMessageBox.SetThemeName(this.radGridView1.ThemeName);
                DialogResult dr = RadMessageBox.Show("The data in the grid was exported successfully. Do you want to open the file?",
                    "Export to Excel", MessageBoxButtons.YesNo, RadMessageIcon.Question);
                if (dr == DialogResult.Yes)
                {
                    openExportFile = true;
                }
            }
            catch (IOException ex)
            {
                RadMessageBox.SetThemeName(this.radGridView1.ThemeName);
                RadMessageBox.Show(this, ex.Message, "I/O Error", MessageBoxButtons.OK, RadMessageIcon.Error);
            }
        }