c# - Get Rows with Different Values or Missing from One Table -


i have 2 tables have similar structures. each table has id , firstvalue , secondvalue field. want use linq-to-sql each row that's in tableone , not in tabletwo (based on id) , each row that's in both tables, has different values of firstvalue or secondvalue. sql should like

select tableone.* tableone      left outer join tabletwo        on tableone.id = tabletwo.id tabletwo.id null     or (tabletwo.id not null ,          (tableone.firstvalue <> tabletwo.firstvalue or          tableone.secondvalue <> tabletwo.secondvalue         )        )

i've tried 

(from in context.tableone  b in context.tabletwo.where(b =>           a.id == b.id &&          (a.firstvalue != b.firstvalue ||           a.secondvalue != b.secondvalue)).defaultifempty()  select a).tolist();

the problem in query if tableone , tabletwo have matching values, row still gets returned, of tabletwo values null. if row has same values in each table, want not returned @ all.

use groupjoin records second table correspond entity in first table. records either don't have matching records in second table, or have different values:

from in context.tableone join b in context.tabletwo on a.id equals b.id g b in g.defaultifempty() b == null || a.firstvalue != b.firstvalue || a.secondvalue != b.secondvalue select

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