NULLReferenceException when using LINQ query with In clause

hi,

i not sure code breaking. kindly it's production issue. it's not happening in sit, on production. nullreferenceexception occurring when below method called:

        internal bool isfilingpartywithactivelab(string docid)
        {
            ibackendmediator bckendmd = null;
            list<doccasepartyentity> lstdcpwithlab = null;
            try
            {
                if (!string.isnullorempty(docid))
                {
                    bckendmd = new backendmediatorimpl();
                    list<doccasepartyentity> lstdcp = bckendmd.getlistdoccasepartybydocid(docid);
                    lstdcpwithlab = new list<doccasepartyentity>();
                    if (lstdcp != null && lstdcp.count > 0)
                    {
                        lstdcpwithlab = (from dcp in lstdcp
                                         dcp.filingind == filingpartyind.y &&
                                         dcp.haslac == yesno.y
                                         select dcp).tolist();
                    }

                    if (lstdcpwithlab != null && lstdcpwithlab.count > 0)
                    {
                        foreach (doccasepartyentity dcp in lstdcpwithlab)
                        {
                            doccasepartylacdetailentity dcplacdetailentity = bckendmd.getdoccasepartylacdetailbydcpid(dcp.dcpid);
                            if (dcplacdetailentity != null)
                            {
                                if (dcplacdetailentity.lacrefstatus == lacrefstatus.a)
                                {
                                    return true;
                                }
                            }
                        }
                    }
                }
            }
            catch (exception ex)
            {
                log.error("exception during isfilingpartywithactivelab()", ex);
                throw;
            }
            return false;
        }

logged error is:

error 2015-04-16 10:23:05,296 20 iels.backend.tasklist.business.tasklistlabservice - exception during isfilingpartywithactivelab()
system.nullreferenceexception: object reference not set instance of object.
   @ iels.backend.tasklist.business.tasklistlabservice.isfilingpartywithactivelab(string docid)
debug 2015-04-16 10:23:05,296 56 crimsonlogic.common.dms.utilities.sharepointhelper - :end getspfolder(http://url, ielsformxmltemplates)
error 2015-04-16 10:23:05,296 20 iels.backend.tasklist.presentation.taskitemapprovalpage - taskitemapproval: method-taskitemapproval.bindwaiverfeedetails, msg-system.nullreferenceexception: object reference not set instance of object.
   @ iels.backend.tasklist.business.tasklistlabservice.isfilingpartywithactivelab(string docid)
   @ iels.backend.tasklist.presentation.taskitemapprovalpage.bindwaiverfeedetails(list`1 feelistdto)
error 2015-04-16 10:23:05,296 20 iels.backend.tasklist.presentation.taskitemapprovalpage - tasklistapprovalpageexception occured @ page_load
system.nullreferenceexception: object reference not set instance of object.
   @ iels.backend.tasklist.business.tasklistlabservice.isfilingpartywithactivelab(string docid)
   @ iels.backend.tasklist.presentation.taskitemapprovalpage.bindwaiverfeedetails(list`1 feelistdto)
   @ iels.backend.tasklist.presentation.taskitemapprovalpage.page_load(object sender, eventargs e)
error 2015-04-16 10:23:05,296 20 crimsonlogic.legal.bootstrapper.backend.exceptionhandlermodule - unhandled error occurred -
system.nullreferenceexception: object reference not set instance of object.
   @ iels.backend.tasklist.business.tasklistlabservice.isfilingpartywithactivelab(string docid)
   @ iels.backend.tasklist.presentation.taskitemapprovalpage.bindwaiverfeedetails(list`1 feelistdto)
   @ iels.backend.tasklist.presentation.taskitemapprovalpage.page_load(object sender, eventargs e)
   @ system.web.util.callihelper.eventargfunctioncaller(intptr fp, object o, object t, eventargs e)
   @ system.web.util.callieventhandlerdelegateproxy.callback(object sender, eventargs e)
   @ system.web.ui.control.onload(eventargs e)
   @ system.web.ui.control.loadrecursive()
   @ system.web.ui.control.loadrecursive()
   @ system.web.ui.control.loadrecursive()
   @ system.web.ui.control.loadrecursive()
   @ system.web.ui.control.loadrecursive()
   @ system.web.ui.page.processrequestmain(boolean includestagesbeforeasyncpoint, boolean includestagesafterasyncpoint)
error 2015-04-16 10:23:05,296 20 crimsonlogic.legal.bootstrapper.backend.bootstrapper - unknown application error occurred.

thanks, ss

hi all,thanks support.

issue has been resolved. problem not first if, last if. sit code didn't have null condition check , the code have pasted in question local environment. when restored dll sit local, reproduce issue in local. realized null check not in sit. therefore production throwing error.

once again lot.

~ss

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