c# - Import values from Excel -

i have excel file:

(you can see cell names (or codes) signed red color).

i search way read data on excel template that, in future, in these cells. think of use cell code, don't know how. had tried in way:

public partial class caricadocumento : system.web.ui.page {     protected void page_load(object sender, eventargs e)     {         upload();     }      protected void upload()     {         filestream stream = file.open("c:\\template_p6.xlsx", filemode.open, fileaccess.read);          // reading openxml excel file (2007 format; *.xlsx)         iexceldatareader excelreader = excelreaderfactory.createopenxmlreader(stream);          // data reader methods         while (excelreader.read())         {             int = excelreader.getordinal("ao10"); // doesn't works: throw system.notsupportedexception             var s = excelreader.getvalue(i);             system.console.writeline(s.tostring());         }          //free resources         excelreader.close();     }  } 

i didn't find nothing simple use. have read 3rd-party libraries, prefer avoid using them (if possible).

you can read artical http://www.codeproject.com/tips/696864/working-with-excel-using-csharp , download porject (if signed in)

or read it, if want use openxml.dll open xml excel read cell value