vb.net - pastespecial Crashing when pasting excel data -


i using following code data several excel files , paste them single new file:

    = 0 amountoffiles - 1          dim xlappsource new excel.application         dim xlapptarget new excel.application         dim xlwbsource excel.workbook         dim xlwbtarget excel.workbook         dim xlsheetsource excel.worksheet         dim xlsheettarget excel.worksheet          dim currentfile string = strfilenames(i)         dim intamountofrows integer = amountofrows(currentfile)         dim intstartofemptyrow int16 = amountofrows(summarylocation)          'set current workbook         xlwbsource = xlappsource.workbooks.open(currentfile)         xlwbtarget = xlapptarget.workbooks.open(summarylocation)          'set current worksheet         xlsheetsource = xlwbsource.activesheet         xlsheettarget = xlwbtarget.activesheet          'copy range of data source target file         xlsheetsource.range("a2:k" & intamountofrows).copy()         xlsheettarget.range("a2:k" & intstartofemptyrow).pastespecial(excel.xlpastetype.xlpasteall, excel.xlpastespecialoperation.xlpastespecialoperationnone, false, false)          'set focus on summary excelsheet         xlwbtarget = xlappsource.workbooks.open(summarylocation)         xlsheetsource = xlwbtarget.activesheet          'close excel         xlwbsource.close(true)         xlwbtarget.close(true)         xlappsource.quit()         xlapptarget.quit()          'cleanup         xlappsource = nothing         xlapptarget = nothing         xlwbsource = nothing         xlwbtarget = nothing         xlsheetsource = nothing         xlsheettarget = nothing      next

however, when execute code, throws following error:

comexception

"method pastespecial of class range has failed"

wich points line:

xlsheettarget.range("a2:k" & intstartofemptyrow).pastespecial(excel.xlpastetype.xlpasteall, excel.xlpastespecialoperation.xlpastespecialoperationnone, false, false)

i have no idea how solve this, seeing pretty general error, googling gives me next none answers.

i have found way want, don't know why. not accept own answer, wait explain it.

the code used is: 

'copy range of data source target file xlsheetsource.range("a2:k" & intamountofrows).copy() xlsheettarget.range("a" & intstartofemptyrow).pastespecial(excel.xlpastetype.xlpastevalues)

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