vb.net - VB .net Fingerprint Verification -- Object reference not set to an instance of an object -


i having problem in fingerprint verification using vb .net 2010. sql statement able retrieve value , able convert bytes template.

error says templa8 not set.

error starts @ verificator.verify(features, templa8, result)

her error,

dpfp.error.sdkexception: event handler has generated exception ---> system.nullreferenceexception: object reference not set instance of object.    @ ldps.frmverify.process(sample sample) in d:\my files\c# projects\ldps\frmverify.vb:line 66    @ ldps.frmverify.oncomplete(object capture, string readerserialnumber, sample sample) in d:\my files\c# projects\ldps\frmverify.vb:line 140    @ dpfp.capture.capture.messagereceived(message& m)    --- end of inner exception stack trace ---    @ dpfp.capture.capture.messagereceived(message& m)    @ dpfp.capture.capture.messageevents.messagewindow.wndproc(message& m)

my code follows:

protected sub process(byval sample dpfp.sample)     drawpicture(convertsampletobitmap(sample))      dim features dpfp.featureset = extractfeatures(sample, dpfp.processing.datapurpose.verification)      if textbox2.text = string.empty         mysql = "select customerid,fptemplate1 tblfp"     else         mysql = "select a.customerid,b.fptemplate1 fptemplate1,a.customername tblcustomerdetails a, tblfp b a.customerid = b.customerid , customername '%" & textbox2.text & "%'"     end if      conn.open()      ' try      cmd = new sqlcommand(mysql, conn)      dim reader sqldatareader = cmd.executereader()      if reader.hasrows         while reader.read()              dim memstream io.memorystream             dim fpbytes byte()              fpbytes = reader(1)             memstream = new io.memorystream(fpbytes)              dim templa8 dpfp.template = new dpfp.template()             templa8.deserialize(memstream)              me.template = templa8              ' check quality of sample , start verification if it's             if not features nothing                 ' compare feature set our template                 dim result dpfp.verification.verification.result = new dpfp.verification.verification.result()                 verificator.verify(features, templa8, result)                  if result.verified                      dim comments string = "this fingerprint owned " & reader(0).tostring                      messagebox.show(comments)                     exit sub                 else                     messagebox.show("the fingerprint not verified!")                 end if             else                 messagebox.show("fingerprint sample not established!")             end if           end while     else         messagebox.show("no record found!")     end if     cmd.executenonquery()     '    catch ex exception     '       messagebox.show(ex.message, "verification error")     '  end try       conn.close() end sub

please help

problem solved. system works fine now. have added following code.

public event ontemplate(byval templa8)


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