c# - appending to an existing excel file -


i have function writes , saves excel file. want append same existing excel file.this function:

private void button8_click(object sender, eventargs e)//creates excel file , writes data     {         excel.application xlapp = new microsoft.office.interop.excel.application();          if (xlapp == null)         {             messagebox.show("excel not installed!!");             return;         }          if (system.io.file.exists("cross_check.xls"))         {            }         else         {               excel.workbook xlworkbook;             excel.worksheet xlworksheet;             object misvalue = system.reflection.missing.value;              xlworkbook = xlapp.workbooks.add(misvalue);             xlworksheet = (excel.worksheet)xlworkbook.worksheets.get_item(1);             indexprop += 1;              xlworksheet.cells[indexprop, 1] = combobox2.text;             xlworksheet.cells[indexprop, 2] = textbox5.text;             xlworksheet.cells[indexprop, 3] = textbox2.text;             xlworksheet.cells[indexprop, 4] = combobox3.text;             xlworksheet.cells[indexprop, 5] = textbox3.text;             xlworksheet.cells[indexprop, 6] = combobox1.text;               xlworkbook.saveas(@"cross_check.xls", excel.xlfileformat.xlworkbooknormal, misvalue, misvalue, misvalue, misvalue, excel.xlsaveasaccessmode.xlexclusive, misvalue, misvalue, misvalue, misvalue, misvalue);             xlworkbook.close(true, misvalue, misvalue);             xlapp.quit();              marshal.releasecomobject(xlworksheet);             marshal.releasecomobject(xlworkbook);             marshal.releasecomobject(xlapp);              messagebox.show("excel file created succcessfully");         }      } }

this particular block checking file if exists , append operation if exists. how do this? 

 if (system.io.file.exists("cross_check.xls"))         {            }

you want open file make active work book , make changes want. there can save or ever want it.


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