score:1
You need to use DefaultIfEmpty() for an outer join:
from ta in context.test_attempt
join uf in context.user_flag on ta.users.USERID equals uf.UserID into g
from uf in g.DefaultIfEmpty()
select new { ta, uf }
Your outer from/select above is unnecessary, just project ta and uf into what you need.
score:0
You will find examples of different LINQ joins here: http://code.msdn.microsoft.com/LINQ-Join-Operators-dabef4e9 and loads of other LINQ examples too.
score:0
Entity framework in .NET 3.5 doesn't offer left join in Linq queries. The way to get "joined records" is through navigation property between entities
From here: Left Outer Join in Entity Data Model asp.net
Source: stackoverflow.com
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