c# - Left outer join in LINQ is showing exception -

i getting following exception:

the null value cannot assigned member type system.int32 non- nullable value type.

below linq statement questionid primary key in table:

var questionviewsdata =       questionviews in objdc.sc_questionsviews       join questions in objdc.sc_questions       on questionviews.questionid equals questions.questionid qs       questions in qs.defaultifempty()       questionviews.createddate.date == new datetime(2010, 4,27)       select new        {           selected =(questions == null ?-1:questions.questionid),           questiointitle = questions.title,           votescount = questions.votescount        }; 

change line

where questionviews.createddate.date == new datetime(2010, 4,27) 

to

where questionviews.createddate == new datetime(2010, 4, 27) 

as test run

where questionviews.createddate > new datetime(2010, 4, 26) 

n.b. if include .date in linqpad c# statement receive following error message , removing .date allows statement run.

system.nullable<system.datetime>' not contain definition 'date' , no extension method 'date' accepting first argument of type 'system.nullable<system.datetime>' found