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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

Join two linq queries on one key column to get one result set

Here I want to join the out put of the first query(one column) to the result of the 2nd query to get a one result set. How can I merge them.(CONCAT doesn't work as required. eg: var query2 = query.concat(query1);)
var query = (from PP in _db.paymentPlans
join APP in _db.Applications on PP.applicationID equals APP.ApplicationId
join C in _db.Courses on APP.courseID equals C.courseID
where PP.active == true && APP.agentID == agentID
orderby C.courseID ascending
group new {C,PP} by new {C.courseID} into totalRecievable
select new PdPpAppCourseModel
{
courseID = totalRecievable.Key.courseID,
totalAmount = totalRecievable.Sum(x => x.PP.totalAmount)
}).ToList();
var query1=(from PD in _db.paymentDetails
join PP in _db.paymentPlans on PD.paymentPlanID equals PP.paymentPlanID
join APP in _db.Applications on PP.applicationID equals APP.ApplicationId
join C in _db.Courses on APP.courseID equals C.courseID
where PP.active == true && APP.agentID == agentID
orderby C.courseID ascending
group new { C,PD } by new { C.courseID, C.cricosCode, C.courseName } into paymentsCourseWise
select new PdPpAppCourseModel
{
courseID = paymentsCourseWise.Key.courseID,
cricosCode = paymentsCourseWise.Key.cricosCode,
courseName = paymentsCourseWise.Key.courseName,
paidAmount = paymentsCourseWise.Sum(x => x.PD.paidAmount)
}).ToList();

You could join query1 and query like this
var result = (from q1 in query1
join q in query on q1.courseID = q.courseID
select new PdPpAppCourseModel
{
courseID = q1.Key.courseID,
cricosCode = q1.Key.cricosCode,
courseName = q1.Key.courseName,
paidAmount = q1.Sum(x => x.PD.paidAmount),
totalAmount = q.totalAmount
}).ToList();

flatten out webapi EF using DTO and linq- using IF/THEN

I am attempting to flatten out my webapi EF using DTO's. So far I have the below statement working correctly. Now I want to add a layer of complexity stating a IF/THEN. I put a fake code in the first line of SELECT NEW SECTION.
Can someone please assist?
var query = (
from acctTbl in db.Accounts
join tradeTbl in db.Trades on acctTbl.AccountID equals tradeTbl.AccountID into ts
from tradeTbl in ts.DefaultIfEmpty()
join mapClientAcct in db.Mapping_ClientAccounts on acctTbl.AccountID equals mapClientAcct.AccountID
join clientTbl in db.Clients on mapClientAcct.ClientID equals clientTbl.ClientID
join mapUserClient in db.Mapping_UserClients on clientTbl.ClientID equals mapUserClient.ClientID
join aspNetUser in db.AspNetUsers on mapUserClient.AspNetUsersID equals aspNetUser.Id
join mktData in db.MarketDatas on tradeTbl.MarketDataID equals mktData.MarketDataID into ms
from mktData in ms.DefaultIfEmpty()
join mktCode in db.GMI_MarketCodes on tradeTbl.GMI_MarketCodesID equals mktCode.GMI_MarketCodesID into mc
from mktCode in mc.DefaultIfEmpty()
join Mgrs in db.Managers on acctTbl.ManagerID equals Mgrs.ManagerID
join FxMkts in db.ForexMarkets on mktData.crncy equals FxMkts.CurrencySymbol into fm
from FxMkts in fm.DefaultIfEmpty()
where acctTbl.AccountActive == true
&& clientTbl.ClientID == clientID
&& aspNetUser.UserName == username
select new TradeDetailDTO()
{
--THIS IS WHAT I WANT TO DO!!!
IF tradeTblIdentifier == "F" THEN 'yes'
ELSE 'no'
-------------------------
Filedate = tradeTbl.Filedate,
Quantity = tradeTbl.Quantity,
Month = tradeTbl.Month,
Strike = tradeTbl.Strike,
PutCall = tradeTbl.PutCall,
Prompt = tradeTbl.Prompt,
StmtPrice = tradeTbl.Price,
ShortDesc = mktCode.ShortDesc,
Sector = mktCode.Sector,
ExchName = mktCode.ExchName,
BBSymbol = mktData.BBSymbol,
BBName = mktData.Name,
fut_Val_Pt = mktData.fut_Val_Pt,
crncy = mktData.crncy,
fut_tick_size = mktData.fut_tick_size,
fut_tick_val = mktData.fut_tick_val,
fut_init_spec_ml = mktData.fut_init_spec_ml,
last_price = mktData.last_price,
bid = mktData.bid,
ask = mktData.ask,
px_settle_last_dt_rt = mktData.px_settle_last_dt_rt,
px_settle_actual_rt = mktData.px_settle_actual_rt,
chg_on_day = mktData.chg_on_day,
prev_close_value_realtime = mktData.prev_close_value_realtime,
AccountNumber = acctTbl.AccountNumber,
TradeLevel = acctTbl.TradeLevel,
ManagerName = Mgrs.ManagerName,
ManagerShortCode = Mgrs.ManagerShortCode,
ForexLastPrice = db.MarketDatas.FirstOrDefault(x => x.BBSymbol == mktData.crncy + " BGN CURNCY") == null ? 1: db.MarketDatas.FirstOrDefault(x => x.BBSymbol == mktData.crncy + " BGN CURNCY").last_price,
//ForexLastPrice = FxMkts.LastPrice, ORIGINAL
TopdayIdentifier = "P",
DailyPercentage = acctTbl.DailyPercentage,
AccountType = acctTbl.AccountType
}
);

If i understood you correctly you want something like this:
var query = (
from acctTbl in db.Accounts
join tradeTbl in db.Trades on acctTbl.AccountID equals tradeTbl.AccountID into ts
from tradeTbl in ts.DefaultIfEmpty()
join mapClientAcct in db.Mapping_ClientAccounts on acctTbl.AccountID equals mapClientAcct.AccountID
join clientTbl in db.Clients on mapClientAcct.ClientID equals clientTbl.ClientID
join mapUserClient in db.Mapping_UserClients on clientTbl.ClientID equals mapUserClient.ClientID
join aspNetUser in db.AspNetUsers on mapUserClient.AspNetUsersID equals aspNetUser.Id
join mktData in db.MarketDatas on tradeTbl.MarketDataID equals mktData.MarketDataID into ms
from mktData in ms.DefaultIfEmpty()
join mktCode in db.GMI_MarketCodes on tradeTbl.GMI_MarketCodesID equals mktCode.GMI_MarketCodesID into mc
from mktCode in mc.DefaultIfEmpty()
join Mgrs in db.Managers on acctTbl.ManagerID equals Mgrs.ManagerID
join FxMkts in db.ForexMarkets on mktData.crncy equals FxMkts.CurrencySymbol into fm
from FxMkts in fm.DefaultIfEmpty()
where acctTbl.AccountActive == true
&& clientTbl.ClientID == clientID
&& aspNetUser.UserName == username
select new TradeDetailDTO()
{
YesNo = tradeTbl.Identifier == "F"?"yes":"no",
Filedate = tradeTbl.Filedate,
Quantity = tradeTbl.Quantity,
Month = tradeTbl.Month,
Strike = tradeTbl.Strike,
PutCall = tradeTbl.PutCall,
Prompt = tradeTbl.Prompt,
StmtPrice = tradeTbl.Price,
ShortDesc = mktCode.ShortDesc,
Sector = mktCode.Sector,
ExchName = mktCode.ExchName,
BBSymbol = mktData.BBSymbol,
BBName = mktData.Name,
fut_Val_Pt = mktData.fut_Val_Pt,
crncy = mktData.crncy,
fut_tick_size = mktData.fut_tick_size,
fut_tick_val = mktData.fut_tick_val,
fut_init_spec_ml = mktData.fut_init_spec_ml,
last_price = mktData.last_price,
bid = mktData.bid,
ask = mktData.ask,
px_settle_last_dt_rt = mktData.px_settle_last_dt_rt,
px_settle_actual_rt = mktData.px_settle_actual_rt,
chg_on_day = mktData.chg_on_day,
prev_close_value_realtime = mktData.prev_close_value_realtime,
AccountNumber = acctTbl.AccountNumber,
TradeLevel = acctTbl.TradeLevel,
ManagerName = Mgrs.ManagerName,
ManagerShortCode = Mgrs.ManagerShortCode,
ForexLastPrice = db.MarketDatas.FirstOrDefault(x => x.BBSymbol == mktData.crncy + " BGN CURNCY") == null ? 1: db.MarketDatas.FirstOrDefault(x => x.BBSymbol == mktData.crncy + " BGN CURNCY").last_price,
//ForexLastPrice = FxMkts.LastPrice, ORIGINAL
TopdayIdentifier = "P",
DailyPercentage = acctTbl.DailyPercentage,
AccountType = acctTbl.AccountType
}
);

How to convert SQL query with Unions to LINQ?

How to convert this one to LINQ?
select d.UserID, d.Content, d.UpdateTime
from DiaryPosts as d
where d.UserID = 1
/* Friends posts */
Union
select d.UserID, d.Content, d.UpdateTime
from DiaryPosts as d
join Friends as fr
on d.UserID = fr.FriendID
where fr.UserID = 1
/* My followings */
Union
select d.UserID, d.Content, d.UpdateTime
from DiaryPosts as d
join Followers as fl
on d.UserID = fl.FollowerID
where fl.UserID = 1
/* order by UpdateTime desc */
order by 3 desc
I tried this:
var diaryPosts = (from d in db.DiaryPosts
join e in db.EstadosDeAlma
on d.EstadosDeAlmaID equals e.ID
join u in db.User
on d.UserID equals u.ID
join fr in db.Friends
on d.UserID equals fr.FriendID
where fr.UserID == userset.ID
join fl in db.Followers
on d.UserID equals fl.UserID
where fl.FollowerID == userset.ID
orderby d.ID descending
select new DiaryPostsSet
{
PostID = d.ID,
EstadoDeAlmaID = e.ID,
EstadoDeAlma = e.Title,
Author = u.Nickname,
Thumbnail = u.Thumbnail,
AuthorComment = d.Content,
UserID = u.ID,
IsDuplicated = d.IsDuplicated,
FriendID = d.FriendID,
FriendName = u.Nickname,
Time = d.UpdateTime,
MessagesCount = d.FriendMessages.Count(m => m.DiaryPostsID == d.ID)
}).Take(6).ToList();
It doesn't show me any result. I tried with EF clauses but when I have Union, I don't know how to perform the next Join.
Could anyone help me please?

There is a Union Method in LINQ
Here is a hint. When things get difficult break them down, then simplify. I will help you break down the problem and leave the simplification to you.
var query1 = (from d in db.DiaryPosts
where d.UserID = 1
select new {
UserID = d.UserID
Content = d.Content
UpdateTime = d.UpdateTime
}).ToList();
var query2 = (from d in db.DiaryPosts
join f in db.Friends
on d.UserId = f.FriendId
where f.UserId = 1
select new {
UserID = d.UserID
Content = d.Content
UpdateTime = d.UpdateTime
}).ToList();
var query3 = (from d in db.DiaryPosts
join f in db.Followers
on d.UserId = f.FollowerID
where f.UserId = 1
select new {
UserID = d.UserID
Content = d.Content
UpdateTime = d.UpdateTime
}).ToList();
var myunionQuery = query1.Union(query2).Union(query3).OrderBy(d => d.UpdateTime);

Call Method from Linq query

I am using Linq query and call method Like..
oPwd = objDecryptor.DecryptIt((c.Password.ToString())
it will return null value.
Means this will not working.
how I Resolve this.
Thanks..
var q =
from s in db.User
join c in db.EmailAccount on s.UserId equals c.UserId
join d in db.POPSettings
on c.PopSettingId equals d.POPSettingsId
where s.UserId == UserId && c.EmailId == EmailId
select new
{
oUserId = s.UserId,
oUserName = s.Name,
oEmailId = c.EmailId,
oEmailAccId = c.EmailAccId,
oPwd = objDecryptor.DecryptIt(c.Password.ToString()),
oServerName = d.ServerName,
oServerAdd = d.ServerAddress,
oPOPSettingId = d.POPSettingsId,
};

If that is LINQ-to-SQL or Entity Framework. You'll need to break it into steps (as it can't execute that at the DB). For example:
var q = from s in db.User
join c in db.EmailAccount on s.UserId equals c.UserId
join d in db.POPSettings on c.PopSettingId equals d.POPSettingsId
where s.UserId == UserId && c.EmailId == EmailId
select new
{
oUserId = s.UserId,
oUserName = s.Name,
oEmailId = c.EmailId,
oEmailAccId = c.EmailAccId,
oPwd = c.Password,
oServerName = d.ServerName,
oServerAdd = d.ServerAddress,
oPOPSettingId = d.POPSettingsId,
};
then use AsEnumerable() to break "composition" against the back-end store:
var query2 = from row in q.AsEnumerable()
select new
{
row.oUserId,
row.oUserName,
row.oEmailId,
row.oEmailAccId,
oPwd = objDecryptor.DecryptIt(row.oPwd),
row.oServerName,
row.oServerAdd,
row.oPOPSettingId
};

var q = from s in db.User
join c in db.EmailAccount on s.UserId equals c.UserId
join d in db.POPSettings on c.PopSettingId equals d.POPSettingsId
where s.UserId == UserId && c.EmailId == EmailId
select new
{
oUserId = s.UserId,
oUserName = s.Name,
oEmailId = c.EmailId,
oEmailAccId = c.EmailAccId,
oPwd = c.Password,
oServerName = d.ServerName,
oServerAdd = d.ServerAddress,
oPOPSettingId = d.POPSettingsId,
};
foreach (var item in q)
{
item.oPwd = objDecryptor.DecryptIt(row.oPwd),
}
we can use a foreach loop also to update a single property. do not need to select all property in next query.

This has nothing about Linq query. you need to debug method objDecryptor.DecryptIt