Linq and EF4, Inner join conditional statement - asp.net

Question

OrdersRepository ordersRepository = new OrdersRepository();
var productInQuery = ordersRepository.ProductIn;
var orderInfoQuery = ordersRepository.OrderInfo;
var result = (from p in productInQuery
from o in orderInfoQuery
where p.refNo == o.refNo
select new {
t1 = p.no,
t2 = o.no}).ToArray();
I wrote like above code for inner join. and I want to add some conditional statement for OrderInfo context.
...
if(orderDate != DateTime.MinValue){
orderInfoQuery = orderInfoQuery.Where(x => x.orderDate == orderDate);
}
// also I tried this too. no is integer in Mysql and I'm sure there is 222 value.
// but still it return always null...
orderInfoQuery = orderInfoQuery.Where(x => x.no == 222);
var result = (from p in productInQuery
from o in orderInfoQuery
where p.refNo == o.refNo
select new {
t1 = p.no,
t2 = o.no}).ToArray();
I add the conditional statement but it return always null. (I check DB(Mysql) value is existed)
And is it not inner join?
var result = (from p in productInQuery
join o in orderInfoQuery on p.refNo equals o.refNo
select new {
t1 = p.no,
t2 = o.no}).ToArray();
Any body know this, please advice me~
Thank you!
[EDIT]
OMG, I'm so sorry, the productIn and orderInfo is never matched. that's why it return always null.
May I ask question again please,
var result = (from p in productInQuery
join o in orderInfoQuery on p.refNo equals o.refNo
join x in productQuery on p.productNo equals x.no
join t in productOutQuery on p.no equals t.productInNo into productIn
from t in productIn.DefaultIfEmpty()
orderby o.processDate descending
select new
{
qty = p.qty,
dateIn = o.processDate,
dateOut = (DateTime?)(from m in orderInfoQuery where m.refNo == t.refNo select m.processDate).FirstOrDefault(),
etaDate = (DateTime?)(from w in orderInfoQuery where w.refNo == t.refNo select w.eta).FirstOrDefault(),
}).ToArray();
this is my linq code, and I want to search by etaDate now.
how can I write linq code. In above code, the etaDate is just sub query. and I want to get
the date that etaDate is exactly matched with specific date.
could you help me please?
Thank you!

Answer 1

You might want to make sure that the types between the two dates here:
orderDate != DateTime.MinValue
and here:
x.orderDate == orderDate
are in the same date format. If one value has a different format or adds extra precision, then the conditional will always fail.