c# - Editing Excel templates with Open XML SAX -

i'm working on .net c# application queries data database , writes excel template files. tamplate can whatever excel file user uploads system, need place data starting on given row , column.

i using closedxml, turns out doesn't support gradient filling yet, client complained of report being generated without original formatting.

then changed pure openxml, i'm facing out of memory problems large queries.

i searched around , found out write large amounts of data excel using sax approach. problem need maintain whatever else in template spreadsheet, whether data, formatting, image, anything. need able place data in there, add rows or merge data original rows.

i still haven't grasped how sax , haven't find many exemples work with, couple of topics: using template openxml , sax is there sax way loop through openxml rows? http://polymathprogrammer.com/2012/08/06/how-to-properly-use-openxmlwriter-to-write-large-excel-files/ , none of them quite deal exact situation of mine.

i want know if it's possible or if there's better way accomplish need.