Entity Framework executes both INSERT and UPDATE stored procedures when you do INSERT - entity-framework

Question

I have this stored procedure, which is mapped in an Entity Framework 4.1 object. The call is made within the
using (TransactionScope transaction = new TransactionScope())
{
try
{
DbEntity.Car.AddObject(CarInfo);
DbEntity.SaveChanges();
/* Other object savings */
transaction.Complete();
DbEntity.AcceptAllChanges();
}
catch (Exception exp)
{
throw exp;
}
finally
{
DbEntity.Dispose();
}
}
I see the stored procedure mapping done currently. If I execute the stored procedure alone on MS SQL server, it executes it correctly.
Here is the stored procedure
ALTER PROCEDURE [dbo].[Carinsert] #Qty INT
,#StyleID INT
,#TFee MONEY
,#HWayTax MONEY
,#OFees MONEY
,#OFeesDescription NTEXT
,#MUp DECIMAL(18, 4)
,#BAss MONEY
,#PriceMSRP MONEY
,#PriceSpecial MONEY
AS
BEGIN
SET nocount ON
DECLARE #PTotal MONEY
DECLARE #TaxFeesNet MONEY
DECLARE #CarID INT
SET #TaxFeesNet = Isnull(#TFee, 0) + Isnull(#HWayTax, 0)
+ Isnull(#OFees, 0)
IF( #PriceSpecial IS NULL )
BEGIN
SET #PTotal = #PriceMSRP + #TaxFeesNet
END
ELSE
BEGIN
SET #PTotal = #PriceSpecial + #TaxFeesNet
END
INSERT INTO Car
(Qty
,StyleID
,MUp
,BAss
,PriceMSRP
,PriceSpecial
,TFee
,HWayTax
,OFees
,OFeesDescription
,PriceTotal)
VALUES (#Qty
,#StyleID
,#MUp
,#BAss
,#PriceMSRP
,#PriceSpecial
,#TFee
,#HWayTax
,#OFees
,#OFeesDescription
,#PTotal)
SELECT Scope_identity() AS CarID
END
If I execute this like on MS SQL it calculates the PriceTotal column in the table as 3444.00, which is correct.
#Qty= 5,
#StyleID = 331410,
#TFee = NULL,
#HWayTax = NULL,
#OFees = NULL,
#OFeesDescription = NULL,
#MUp = 4,
#BAss = 10000,
#PriceMSRP = 20120,
#PriceSpecial = 3444
When I run the MVC web application, and I debug & see these are the values passed and the PriceTotal comes to 20120.00
I couldn't figure out why it does not do the IF ELSE calculation & use the price.
Does anybody else see something weird? This has been daunting for few days now. Any help appreciated. Thanks
Update
I updated the title to better guide others

Answer 1

After few minutes of posting the question, I figured it all out.
There was actually 2 bug.
Entity framework used the UPDATE stored procedure even when I try to INSERT new records. Just for records, the UPDATE stored procedure required the CarID [primary key]. May be EF first does the INSERT and then does the UPDATE right away, even for creating new records?
The UPDATE sproc had a bug checking for NULL using <>. It should have been IS NOT NULL
In anycase, now This is a bigger issue. How to force EF to use INSERT sproc and not the UPDATE when I only want to do is create a new record?
I tried
DbEntityContext.ObjectStateManager.ChangeObjectState(carInfo, EntityState.Added);
and still EF kept on calling the UPDATE sproc.