Export datas from sql to Excel

There are some articles on this site for exporting to Excel. There might be one that will do a datatable to spreadsheet conversion. I have done some work on exporting to Excel, and the framework makes it quite easy.
You will have to do some customization to make it work, but this should give you a start:

private static void Excel(string fileName, List<IDirectoryInventoryDataCollector> list)
{
  try
  {
    var xlApp = new Excel.Application();
    var xlWorkBook = xlApp.Workbooks.Add();
    var xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
    ExcelTitleRow(list[0], 1, xlWorkSheet);

    int row = 2;
    foreach (var item in list)
    {
      ExcelFillRow(item, row++, xlWorkSheet);
    }

    for (int i = 1; i < list[0].MaxLevel - 1; i++)
    {
      ((Range)xlWorkSheet.Columns[i]).ColumnWidth = 2;
    }
    ((Range)xlWorkSheet.Columns[list[0].MaxLevel - 1]).ColumnWidth = 30;
    ((Range)xlWorkSheet.Rows[1]).WrapText = true;
    ((Range)xlWorkSheet.Rows[1]).HorizontalAlignment = HorizontalAlignment.Center;
    ((Range)xlWorkSheet.Cells[1, 1]).WrapText = false;

    xlWorkBook.SaveAs(fileName);
    xlWorkBook.Close();
    xlApp.Quit();
  }
  catch (AccessViolationException)
  {
    System.Windows.Forms.MessageBox.Show(
       "Have encountered access violation. This could be issue with Excel 2000 if that is only version installed on computer",
       "Access Violation");
  }
  catch (Exception)
  {
    System.Windows.Forms.MessageBox.Show("Unknown error",
       "Unknown error");
  }
}

private static void ExcelFillRow(IDirectoryInventoryDataCollector item, int row, Excel.Worksheet sheet)
{
  sheet.Cells[row, item.Level] = item.Name;
  int column = item.MaxLevel;
  foreach (var property in item.GetProperties())
  {
    sheet.Cells[row, column++] = property;
  }
}

private static void ExcelTitleRow(IDirectoryInventoryDataCollector item, int row, Excel.Worksheet sheet)
{
  sheet.Cells[row, 1] = "Name";
  int column = item.MaxLevel;
  foreach (var property in item.GetPropertyNames())
  {
    sheet.Cells[row, column++] = property;
  }
}

You will need to add a reference to Microsoft.Office.Interop.Excel