how linq outdoor join subtable?

i have information tables form setup.

table a

aid     aname
---------------------
1       a_name1
2       a_name2
3       a_name3

table b

bid     bname
---------------------
10      b_name1
20      b_name2
30      b_name3

table c

aid     bid
---------------------
1       10
2       10
2       20
2       30
3       20
3       30

i wish linq query given id give me list b list c.

so assist 1 i wish bid 20 & 30.

for assist 3 i wish bid 10

for assist 2 zero returned anything returned.

i know sql

select
    b.bid
from b
left outdoor join c c.bid = b.bid a.aid = 1 
-- assist change formed i looking for, 1, 2, 3

what linq equivalent?

please assume i have objects review tables a, b, c accordingly.

code1