Linq2Sql How to write outer join query?

SELECT
      t.pname
    , t.SlNo AS PNum
    , t.pname AS CName
    , t.Prnt
FROM Tree AS t
--LEFT OUTER JOIN Tree AS t2 ON t.Prnt = t2.SlNo
WHERE t.Ref = 155
ORDER BY t.Prnt

SELECT X.master_key, X.vendor_code  
FROM X 
INNER JOIN Y ON X.parent_key = Y.master_key 
LEFT OUTER JOIN X AS x2 ON x2.parent_key = Y.master_key AND x2.INITIALS = Y.DEFAULT_INITIALS AND x2.VENDOR_CODE = Y.VENDOR_ABBREV 
WHERE Y.project_name = 'TEST' 

SELECT vnd.master_key, vnd.vendor_code  
FROM vnd
INNER JOIN vnm ON vnm.master_key = vnd.parent_key AND vnm.inactive = 0 
LEFT OUTER JOIN vnd vn2 ON vnm.master_key = vn2.parent_key AND vn2.INITIALS = vnm.DEFAULT_INITIALS AND vn2.VENDOR_CODE = vnm.VENDOR_ABBREV
WHERE vnd.inactive = 0 AND vnm.project_name = 'TEST'  
ORDER BY LOWER(vnm.company_name   +  ' '), LOWER(vnd.vendor_code)  ,LOWER(vnd.first_name   +  ' '), LOWER(vnd.last_name   +  ' ')

    DECLARE @Table1 TABLE 
        (Id INT, Message VARCHAR(7), Call INT, status VARCHAR(7), EMail VARCHAR(11), subject VARCHAR(12))
    ;

    INSERT INTO @Table1
        (Id, Message, Call, status, EMail, subject)
    VALUES
        (1, 'hi', 2222, 'Replied', 'g.m.p@m.com', 'Log a cll'),
        (2, 'hello', 2222, 'Replied', 'g.m.p@m.com', 'Re:'),
        (3, 'hi2', 2222, 'New', 'g.m.p@m.com', 'Re:log a cll'),
        (4, 'hello2', 2223, 'Read', 'g.p@m.com', 'Log a cldf'),
        (5, 'how r u', 2223, 'New', 'g.p@m.com', 'Re:Log a')
    ;

        SELECT T.Id,
        TT.Message,
        TT.Call,
        TT.status,
        TT.EMail,
        TT.subject 
        FROM @Table1 tt 
        LEFT OUTER JOIN 
        (
        SELECT Id,
        MAX(subject) OVER(PARTITION BY call ORDER BY call) subject,
        MAX(Message) OVER(PARTITION BY call ORDER BY call) Message  FROM @Table1)T
        ON T.Id = TT.Id AND T.Message = TT.Message AND T.subject = TT.subject
WHERE T.id IS NOT NULL