c# - threading problem (reading and writing to one excel file) -

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i have application, something. generaly main task analise , drawing charts after getting data excel file. application can @ same time max. 10 analise , each of them execute in separate thread in separate tabpage control. great moment when appearing 3 problems.

  1. i can't reading data 1 excel file few analises. if i'm using 1 file 1 analise , want use same file it's not possible beacuse there massage file acctually using process. read data excel file i'm using oledbconnection schema. how solve problem.

  2. i have same problem write data 1 file. how force application write same message different threads 1 file.

  3. if want close application (when 1 of analise working) there show me message communication: "interruption lasted thread (or that)". don't know why. support

please me solve problems beacuse i'm trying solve sice monday , there no effect :(

possible example

string  fullexcelfilepath = "c:\excelfile.xls";   excel.application xlapp = new excel.application()  excel.workbook xlworkbook1 = xlapp.workbooks.add(fullexcelfilepath); excel.workbook xlworkbook2 = xlapp.workbooks.add(fullexcelfilepath);  //then in first threadcall foreach(excel.worksheet in xlworkbook1.sheets) { //get want }   //then in 2nd threadcal foreach(excel.worksheet in xlworkbook2.sheets) { //get want }

other option is:

you make copy of xls other thread, ,

use copy of xls file in other thread.

file.copy(strfilename, strdestination);

then afterwards delete it

file.delete(strfilenamesecondversion)

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