c# - Why am I getting a Specified Cast is not valid error? -

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i've developed application asp.net mvc 2, , after deploying it, invalidcastexception:

error/exception: "specified cast not valid."

stacktrace:

[invalidcastexception: specified cast not valid.]    system.data.sqlclient.sqlbuffer.get_time() +77    system.data.sqlclient.sqldatareader.gettimespan(int32 i) +56    read_question(objectmaterializer`1 ) +1740    system.data.linq.sqlclient.objectreader`2.movenext() +29    system.collections.generic.list`1..ctor(ienumerable`1 collection) +7667556    system.linq.enumerable.tolist(ienumerable`1 source) +61    testenvironment.managements.questionmanager.getquestionsbytestid(int32 testid) in d:\parallelminds\projects\testapplication\testenvironment\testenvironment\managements\questionmanager.cs:131    testenvironment.controllers.loadtestcontroller.index(nullable`1 testid) in d:\parallelminds\projects\testapplication\testenvironment\testenvironment\controllers\loadtestcontroller.cs:31    lambda_method(executionscope , controllerbase , object[] ) +86    system.web.mvc.actionmethoddispatcher.execute(controllerbase controller, object[] parameters) +17    system.web.mvc.reflectedactiondescriptor.execute(controllercontext controllercontext, idictionary`2 parameters) +178    system.web.mvc.controlleractioninvoker.invokeactionmethod(controllercontext controllercontext, actiondescriptor actiondescriptor, idictionary`2 parameters) +24    system.web.mvc.<>c__displayclassd.<invokeactionmethodwithfilters>b__a() +53    system.web.mvc.controlleractioninvoker.invokeactionmethodfilter(iactionfilter filter, actionexecutingcontext precontext, func`1 continuation) +258    system.web.mvc.<>c__displayclassf.<invokeactionmethodwithfilters>b__c() +20    system.web.mvc.controlleractioninvoker.invokeactionmethodwithfilters(controllercontext controllercontext, ilist`1 filters, actiondescriptor actiondescriptor, idictionary`2 parameters) +193    system.web.mvc.controlleractioninvoker.invokeaction(controllercontext controllercontext, string actionname) +300    system.web.mvc.controller.executecore() +104    system.web.mvc.controllerbase.execute(requestcontext requestcontext) +36    system.web.mvc.controllerbase.system.web.mvc.icontroller.execute(requestcontext requestcontext) +7    system.web.mvc.<>c__displayclass8.<beginprocessrequest>b__4() +34    system.web.mvc.async.<>c__displayclass1.<makevoiddelegate>b__0() +21    system.web.mvc.async.<>c__displayclass8`1.<beginsynchronous>b__7(iasyncresult _) +12    system.web.mvc.async.wrappedasyncresult`1.end() +53    system.web.mvc.mvchandler.endprocessrequest(iasyncresult asyncresult) +30    system.web.mvc.mvchandler.system.web.ihttpasynchandler.endprocessrequest(iasyncresult result) +7    system.web.callhandlerexecutionstep.system.web.httpapplication.iexecutionstep.execute() +8681102    system.web.httpapplication.executestep(iexecutionstep step, boolean& completedsynchronously) +155

why getting error when deploy application? works fine in local development server, , exception on 1 page.

without more details guess table accessing on deployment database inconsistent table on development database.

maybe have column of different type on local machine.

either or there invalid data in record retrieving in deployment database.


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