vb.net - Unable to cast object of type, -


this first post hope right place , please nice! thanks.

so issue error while downloading file. have made downloader app download specific file. runs fine until hits download complete event.

here code:

private sub cmddownload_click(byval sender system.object, byval e system.eventargs) handles cmddownload.click       try         dim webclient new webclient()         addhandler webclient.downloadprogresschanged, addressof client_progresschanged         addhandler webclient.downloadfilecompleted, addressof client_downloadfilecompleted         webclient.downloadfileasync(new uri("https://dl.dropbox.com/s/wtdagv0xvliwvv2/viruslist.dat?dl=0"), application.startuppath + "\viruslist.dat")     catch ex exception      end try end sub  public sub client_progresschanged(byval sender object, byval e system.net.downloadprogresschangedeventargs)     try         dim bytesin double = double.parse(e.bytesreceived.tostring())         dim totalbytes double = double.parse(e.totalbytestoreceive.tostring())         dim percentage double = bytesin / totalbytes * 100         progbar.value = integer.parse(math.truncate(percentage).tostring())         label3.text = "total complete " + progbar.value.tostring + " %"     catch ex exception      end try end sub  public sub client_downloadfilecompleted(byval sender object, byval e system.net.downloaddatacompletedeventargs)     messagebox.show("database has finished downloading!", "download finished...", messageboxbuttons.ok, messageboxicon.exclamation) end sub

the error an

unhandled exception: system.invalidcastexception: unable cast object type 'system.componentmodel.asynccompletedeventargs' type 'system.net downloaddatacompletedeventargs', @ database_download.frm.main._lambda$__1(object a0. asynccompletedeventargs a1)

like said runs fine until needs fire downloadcomplete, not messagebox @ pops error. don't understand because have done exact code in other projects without problems. please help!

change signature. msdn documentation

public sub client_downloadfilecompleted(byval sender object, byval e system.componentmodel.asynccompletedeventargs)    messagebox.show("database has finished downloading!", "download finished...", messageboxbuttons.ok, messageboxicon.exclamation) end sub

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