pdf - Releasing memory held in objects in VB.NET -


i using 3rd party dll pdf-tools parse pdf files inside vb.net application , write extracted data sql localdb database. i'm giving user 2 options: select pdf file parsing or point folder , application loop through pdf files inside it. both options call same procedure dopdffile() below.

the problem is: if import number of files individually selecting file every time, program runs fine. however, if select folder contains same files, memory used program keep growing further , further. in windows task manager, can reach 1 gb after importing around 30 files.

i used ants memory profiler redgate, , showed 1 object called "graphicsstate" part of pdf-tools object growing big when looping inside folder. not happen if select same files 1 one. besides memory problem, application becomes slow after parsing files. questions is: why happening? , how prevent it? user should able point program folder hundreds of pdf files, how can achieve this?

below snapshot of code:

'when user selects 1 file private sub opentoolstripmenuitem_click(...)     openfiledialog1.filename.tostring    dopdffile() end sub  'when user selects folder private sub looptoolstripmenuitem_click() handles looptoolstripmenuitem.click     folderbrowserdialog1.showdialog()     spath = folderbrowserdialog1.selectedpath     each filename string in io.directory.getfiles(...)         spath = filename         dopdffile()     next end sub

inside dopdffile() procedure, i'm doing following, i'm using document object pdf-tools , i'm passing byref procedure:

public sub dopdffile()    using document new pdftools.pdfextract.document        document.open(spath)        findfirstpage(document) 'passing reference        parsefirstpage(document) 'passing reference        'storing parsed text in array       '.......                   'extracting colors graphicsstateobject inside document object:            using objgraphicsstate pdftools.pdfextract.graphicsstate = content.graphicsstate                scolor = objgraphicsstate.fillcolorrgb            end using            'save text , color in array of objects        until endoftext    end using end sub


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