there is my code
string workbookPath2 = "E:/Users/entete_temp.xls";
Excel.Application excelApp = new Excel.Application();
excelApp.Visible = false;
Excel.Workbook excelWorkbook = excelApp.Workbooks.Open(workbookPath2,
0, false, 5, "", "", false, Excel.XlPlatform.xlWindows, "",
true, false, 0, true, false, false);
//writing data into excel file
//********************************************************
Excel.Worksheet xlWorkSheet;
xlWorkSheet = (Excel.Worksheet)excelWorkbook.Worksheets.get_Item(1);
xlWorkSheet.Cells[1, 5] = nom;
int ligne = 3;
while (reader.Read()) {
xlWorkSheet.Cells[ligne, 1] = Convert.ToDateTime(reader["date_el"]).ToString("dd/MM/yyyy");
xlWorkSheet.Cells ...
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