LINQ left outer join , Object reference not set to an instance of an object -


i trying perform left outer join on 2 data tables , getting error : object reference not set instance of object. code : 

    var result =                                 datarows1 in dtinv.asenumerable()                                 join datarows2 in dtsal.asenumerable()                                 on datarows1.field<string>("taken_by").toupper() == null ? "" : datarows1.field<string>("taken_by").toupper()                                 equals datarows2.field<string>("taken_by").toupper() == null ? "" : datarows2.field<string>("taken_by").toupper() lj                                 r in lj.defaultifempty()                                  select dtresult.loaddatarow(new object[]                             {                                 datarows1.field<string>("taken_by") == null ? "": datarows1.field<string>("taken_by"),                                 datarows1.field<int>("totalinv") == null ? 0 : datarows1.field<int>("totalinv"),                                 datarows1.field<double>("totalamt") == null ? 0.00 : datarows1.field<double>("totalamt"),                                 r == null ? 0 : r.field<int>("totalsal"),                                 r == null ? 0 : r.field<double>("salamt")                             }, false);


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