Thanks for sending code.... Its working sir.... Thanks a lot....

Here is how I formatted the Excel file:

private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
{
 var exporter = new DataPresenterExcelExporter();
 string file = currentReport + " " + DateTime.Now.ToString("ddMMyy hhmmss") + ".xls";
 exporter.HeaderLabelExporting += exporter_HeaderLabelExporting;
 exporter.RecordExported += exporter_RecordExported;
 Workbook workbook = new Workbook(WorkbookFormat.Excel97To2003, WorkbookPaletteMode.CustomPalette);
 exporter.Export(Project, workbook);
 workbook.Save(file);
 // SaveExport(workbook);
}
void exporter_RecordExported(object sender, RecordExportedEventArgs e)
{
 if (e.Record is Infragistics.Windows.DataPresenter.GroupByRecord)
 {
  WorksheetMergedCellsRegionCollection mergedRegions = e.CurrentWorksheet.MergedCellsRegions;
  if (mergedRegions.Count != 0)
  {
   WorksheetMergedCellsRegion lastMergedRegion = mergedRegions[mergedRegions.Count - 1];
   lastMergedRegion.CellFormat.Alignment = HorizontalCellAlignment.Center;
   lastMergedRegion.CellFormat.Font.Bold = ExcelDefaultableBoolean.True;
   lastMergedRegion.CellFormat.FillPatternForegroundColor = System.Drawing.Color.FromArgb(196, 189, 151);
  }
 }
}
private void exporter_HeaderLabelExporting(object sender, HeaderLabelExportingEventArgs e)
{
 e.FormatSettings.FillPatternForegroundColor = System.Windows.Media.Color.FromArgb(255, 221, 217, 196);
}

Hi... i am sending the format of my excel which it should be.i am generating excel from xamdatagrid which i have send sample application.In that i am exporting to excel and format of that excel should be like this wat i am sending now.....