[Débutant] conversion requete sql en linq

bonjour
je n'arrive pas à convertir correctement ma requete sql en linq:

Code:

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SELECT       TOP (1) SystemVersion.Version
FROM            SystemVersionStatus INNER JOIN
                         SystemVersion ON SystemVersionStatus.SystemVersionStatusId = SystemVersion.SystemVersionStatusId RIGHT OUTER JOIN
                         Requete INNER JOIN
                         RequeteTool INNER JOIN
                         ValeurRequest ON RequeteTool.RequestId = ValeurRequest.ReqId ON 
                         Requete.RequeteToolID = RequeteTool.RequeteToolID INNER JOIN
                         Client ON ValeurRequest.ValeurID = Client.ClientId ON OSVersion.SystemVersionId = Requete.OSId
WHERE Client.ClientId=''