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The specified LINQ expression contains references to queries that are associated with different contexts c#

I have this simple function that returns a query, but when I try to join 2 tables in different databases, the error raised: The specified LINQ expression contains references to queries that are associated with different contexts.
here is my code.
private object projectcycleFilter(int? pid, int? cid, int UserId)
{
string[] res = { null, "" };
int?[] resint = { null, 0 };
var access_user = (from p in geotagging.webpages_UsersInRoles join s in geotagging.UserProfiles on p.UserId equals s.UserId where p.UserId == UserId select p).ToList();
var x = new object();
var geotaggingquery = (from xx in geotagging.sub_project select xx).AsEnumerable();
var nfmsquery = (from p in nfmsdb.request_for_refund join lr in nfmsdb.lib_regions on p.region_code equals lr.region_code join lp in nfmsdb.lib_provinces on p.prov_code equals lp.prov_code join lc in nfmsdb.lib_cities on p.city_code equals lc.city_code join lb in nfmsdb.lib_brgy on p.brgy_code equals lb.brgy_code join gts in geotaggingquery on p.sub_project_id equals gts.sub_project_id select new { lb, lc, lp, lr, p, gts }).AsEnumerable();
if (access_user.Select(x => x.RoleId).FirstOrDefault() > 2)
{
nfmsquery = (from p in nfmsdb.request_for_refund join lr in nfmsdb.lib_regions on p.region_code equals lr.region_code join lp in nfmsdb.lib_provinces on p.prov_code equals lp.prov_code join lc in nfmsdb.lib_cities on p.city_code equals lc.city_code join lb in nfmsdb.lib_brgy on p.brgy_code equals lb.brgy_code join gt in nfmsdb.user_municipal_access on p.city_code equals gt.city_code join gts in geotaggingquery on p.sub_project_id equals gts.sub_project_id where gt.user_id == UserId && gt.selected == true select new { lb, lc, lp, lr, p, gts }).AsEnumerable();
}
if (!resint.Contains(pid))
{
nfmsquery = nfmsquery.Where(x => x.gts.project_type_id == pid);
}
if (!resint.Contains(cid))
{
nfmsquery = nfmsquery.Where(x => x.gts.cycle_id == cid);
}
var result = nfmsquery.Select(x => new
{
sub_project_id = x.p.sub_project_id,
sub_project_name = x.p.sub_project_name,
region_name = x.lr.region_name,
region_code = x.lr.region_code,
prov_name = x.lp.prov_name,
prov_code = x.lp.prov_code,
city_name = x.lc.city_name,
city_code = x.lc.city_code,
brgy_code = x.lb.brgy_code,
brgy_name = x.lb.brgy_name,
request_for_refund_id = x.p.request_for_refund_id,
total_sub_project_cost = x.p.total_sub_project_cost,
total_program_cost = x.p.total_program_cost,
region_director = x.p.region_director,
lbp_branch = x.p.lbp_branch,
address = x.p.address,
lcc_amount = x.p.lcc_amount,
account_name = x.p.account_name,
bank_no = x.p.bank_no,
amount_requested = x.p.amount_requested,
tranche_id = x.p.tranche_id,
prev_amount_release = x.p.prev_amount_release,
cumul_total_request = x.p.cumul_total_request,
date_created = x.p.date_created,
date_requested = x.p.date_requested,
brgy_chair_name = x.p.brgy_chair_name,
bspmc_name = x.p.bspmc_name,
ac_name = x.p.ac_name,
lprao_name = x.p.lprao_name,
lprao_date = x.p.lprao_date,
rpc_name = x.p.rpc_name,
rpm_name = x.p.rpm_name,
ac_date = x.p.ac_date,
rpc_date = x.p.rpc_date,
rpm_date = x.p.rpm_date,
updated_by = x.p.updated_by,
date_updated = x.p.date_updated,
isdeleted = x.p.isdeleted,
}).ToList();
return result;
}
I also try var geotaggingquery = (from xx in geotagging.sub_project select xx).ToList() and `var nfmsquery = (from p in nfmsdb.request_for_refund join lr in nfmsdb.lib_regions on p.region_code equals lr.region_code join lp in nfmsdb.lib_provinces on p.prov_code equals lp.prov_code join lc in nfmsdb.lib_cities on p.city_code equals lc.city_code join lb in nfmsdb.lib_brgy on p.brgy_code equals lb.brgy_code join gts in geotaggingquery on p.sub_project_id equals gts.sub_project_id select new { lb, lc, lp, lr, p, gts }).ToList();, nothing happens.
Thanks in advance

Converting complex SQL with FULL JOIN to Linq

I am trying to convert a SQL statement to Linq/Entity Framework, and am having a difficult time. Below is the SQL.
SELECT
trust.FName,
trust.MName,
trust.LName
tla.Address,
tma.Address,
at.Descr
FROM CLIENTSSUITS cs
INNER JOIN TRUSTS trust ON trust.SSN = cs.CLIENT
FULL JOIN ADV_TYPES at ON at.CODE = trust.AT
LEFT OUTER JOIN CLIENTADDRESSES tla ON tla.SSN = trust.SSN AND tla.ID = 'L'
LEFT OUTER JOIN CLIENTADDRESSES tma ON tma.SSN = trust.SSN AND tma.ID = 'M'
WHERE cs.PRIMARY = w AND SecondaryRole = x AND cs.ID = y AND cs.Rev = z AND cs.DELETED = 0
GROUP BY trust.FName,
trust.MName,
trust.LName,
tla.Address,
tma.Address,
at.Descr
The FULL JOIN and the GROUP BY seem to be what I'm struggling most with. I've reviewed this SO answer and I understand how to execute a FULL JOIN on its own, but can't figure out how to integrate that into the larger overall query.
TYA for any answers.

Try this
using(var ctx = new Dbcontext())
{
var list = (
from cs in ctx.CLIENTSSUITS
join trust in ctx.TRUSTS on cs.CLIENT equals trust.CLIENT
join at in ctx.ADV_TYPES on at.CODE equals trust.AT into temp from temp.DefaultIfEmpty()
join tla1 in ctx.CLIENTADDRESSES on tla.SSN equals trust.SSN && tla.ID = 'L' into temp2 from subtla1 in temp2.DefaultIfEmpty()
join tla2 in ctx.CLIENTADDRESSES on tla2.SSN equals trust.SSN && tla2.ID = 'M' into temp3 from subtla2 in temp3.DefaultIfEmpty()
where (cs.PRIMARY = w && ?.SecondaryRole = x && cs.ID = y && cs.Rev = z && cs.DELETED = 0)
select new
{
FName = trust.FName,
MName = trust.MName,
LName = trust.LName
LAddress = tla.Address,
MAddress = tma.Address,
Descr = at.Descr
}).ToList();
}
//if the list contains the right result then you can easily group it with this code
var results = list.GroupBy(x => new {
x.FName, x.MName, x.LName, x.LAddress, x.MAddress, Descr
});

linq left join with filtering in joined

I am getting duplication meals here
IEnumerable<DTOHotMealsPrice> lst = (from m in this.dbEntity.HOT_MEALS
join ml in this.dbEntity.HOT_MEALS_PRICE on m.MEALSID equals ml.MEALSID into mls
from mls1 in mls.DefaultIfEmpty()
where mls1.HOTID==hotelId
select new DTOHotMealsPrice
{
MEALSID = m.MEALSID,
MEALSNAME = m.MEALSNAME,
CHPRICE = mls1.CHPRICE,
PRICE = mls1.PRICE,
HOTID = mls1.HOTID
}).Distinct().ToList();
I want to list all HOT_MEALS and also join with
HOT_MEALS_PRICE when a mealsid reference on it
When mls1.HOTID==hotelId, this will getting innerjoin results
How could it will a proper result

Two Way solve Solution
Remove Where Case
Add where Case In Join table
Show for Where Case Blow Linq Query
first Query
IEnumerable<DTOHotMealsPrice> lst = (from m in this.dbEntity.HOT_MEALS
join ml in this.dbEntity.HOT_MEALS_PRICE.where(c=>c.HOTID==hotelId) on m.MEALSID equals ml.MEALSID into mls
from mls1 in mls.DefaultIfEmpty()
select new DTOHotMealsPrice
{
MEALSID = m.MEALSID,
MEALSNAME = m.MEALSNAME,
CHPRICE = mls1.CHPRICE,
PRICE = mls1.PRICE,
HOTID = mls1.HOTID
}).Distinct().ToList();
Second is:
IEnumerable<DTOHotMealsPrice> lst = (from m in this.dbEntity.HOT_MEALS
join ml in this.dbEntity.HOT_MEALS_PRICE on m.MEALSID equals ml.MEALSID into mls
from mls1 in mls.where(c=>c.HOTID==hotelId).DefaultIfEmpty()
select new DTOHotMealsPrice
{
MEALSID = m.MEALSID,
MEALSNAME = m.MEALSNAME,
CHPRICE = mls1.CHPRICE,
PRICE = mls1.PRICE,
HOTID = mls1.HOTID
}).Distinct().ToList();

Translate nested select of oracle query to linq

I was given an oracle query and am trying to translate it to linq. I have been successful up to the point of the inner select.
select distinct pm.projNumber, nvl(s.submission_nbr, ppo.submission_nbr) submission_nbr, nvl(ot.objectname, pot.objectname) objectname , wa.assigned, f.lname, f.fname
from wfassignment wa
join CodeTab c on c.codeid = wa.appr_stat
join projobject po on po.objectid = wa.objectid
join projmain pm on pm.projid = po.projid
join hhistory s on s.Prop_no = pm.Prop_No and s.Inst_Code = pm.Inst_Code and pm.System = 'foo' and s.mark = po.mark
left join objecttypes ot on ot.objecttype = po.objecttype and ot.system = pm.system
left join(
select a.mark, a.objecttype, a.submitdate, c.submission_nbr
from projobject a
join b on b.projid = a.projid
join c on c.Prop_no = b.Prop_No and c.Inst_Code = b.Inst_Code and b.System = 'foo' and c.mark = a.mark ) ppo on ppo.mark = s.parentmark
left join objecttypes pot on pot.objecttype = ppo.objecttype and pot.system = pm.system
join faculty f on f.unique_id = wa.unique_id
where wa.completed is null and wa.unique_id in ('foo', 'bar', 'foo', 'bar')
below is my C# code up until "left join (select... )"
var pageObject = (
from wa in db.WFASSIGNMENTs
join c in db.CODETABs on wa.APPR_STAT equals c.CODEID
join po in db.PROJOBJECTs on wa.OBJECTID equals po.OBJECTID
join pm in db.PROJMAINs on po.PROJID equals pm.PROJID
join s in db.HHISTORies on new { pm.PROP_NO, pm.INST_CODE, po.MARK } equals new { s.PROP_NO, s.INST_CODE, s.MARK }
join ot in db.OBJECTTYPES on new { OBJECTTYPE = po.OBJECTTYPE, pm.SYSTEM } equals new { OBJECTTYPE = ot.OBJECTTYPE1, ot.SYSTEM }
How do I translate the inner select to linq?

I pulled out the inner select into another variable and just joined that variable. Did the trick.

Incorrect values after SQL to LINQ convertion

I need to convert following SQL into LINQ
select
app.id,
app.name,
app.version,
s.application,
s.analysis,
s.behaviour,
(select count(ia.id)
from appInstalled ia
JOIN deviceUser ud ON ia.device_id = ud.device_id
where ia.app_id = app.id) as deviceCount,
max(alrt.alert_date)
from application app
left join score s on app.app_md5 = s.md5hash
left join alert alrt on app.id = alrt.app_id
where app.name like '%gpsnav%'
group by device;
This is what I've done so far
var appQuery = (from app in entities.applications
join score in entities.scores on app.app_md5 equals score.md5hash into appScore
join alrt in entities.alerts on app.id equals alrt.app_id into appAlerts
from s in appScore.DefaultIfEmpty()
from a in appAlerts.DefaultIfEmpty()
let deviceCount = (from iapp in entities.appInstalled
join ud in entities.deviceUser on iapp.device_id equals ud.device_id
where iapp.id == app.id
select iapp.id).Count()
where string.IsNullOrEmpty(searchTerm) || app.name.ToLower().Contains(searchTerm.ToLower())
select new
{
AppId = app.id,
AppName = app.name,
AppVersion = app.version,
AppScore = s.application,
Analysis = s.analysis,
Behavior = s.behaviour,
Devices = deviceCount,
AlertDate = a.alert_date
});
var grouped = from a in appQuery
group a by new
{
a.AppId,
a.AppName,
a.AppVersion,
a.AppScore,
a.Analysis,
a.Behavior,
a.Devices,
a.AlertDate
} into g
select new
{
g.Key.AppId,
g.Key.AppName,
g.Key.AppVersion,
g.Key.AppScore,
g.Key.Analysis,
g.Key.Behavior,
g.Key.Devices,
AlertDate = g.Max(x=>x.AlertDate)
};
The above LINQ works but the data is incorrect for Device and AlertDate. What I am missing in here? Also I am not getting max of AlertDate while grouping in LINQ.