Linq - How to construct this query without the 'join' keyword? -

i have following partial linq query:

var query = ri in routeinstance         join rir in routeinstancerules on ri.routeinstanceid equals rir.routeinstanceid         join rl in routinglocation on rir.routinglocationid equals rl.routinglocationid         join rlh in routinglocationhistory on rl.routinglocationid equals rlh.routinglocationid         rlh.routetakentime >= new system.datetime(2011,2,4) && rlh.routetakentime <= new system.datetime(2011,2,5)  there 1:m relationship between routeinstance , routeinstancerules there 1:m relationship between routeinstancerules , routinglocation there 1:m relationship between routinglocation , routinglocationhistory 

since these relationships enforced using fks , therefore known l2s, should able construct query without using 'join' keyword. but, stumped how it.

thanks.

you want routeinstances in end? if so:

var query = datacontext.routinglocationhistory            .where(rlh => rlh.routetakentime >= new system.datetime(2011,2,4)                          && rlh.routetakentime <= new system.datetime(2011,2,5))            .select(rlh => rlh.routinglocation.routeinstancerule.routeinstance)            .distinct();