Application Hangs With LINQ To SQL/SQL CE

Apr 17, 2008

We have an application that is built with WPF/.net 3.5 and leverages LINQ to SQL. Everything runs as expected when our application connects to MS SQL Server 2005. We have made a SQL CE version of our database using the Microsoft SYNC framework, and SQLMetal.exe to generate our .dbml.

The issue we are running into is that our application hangs while our LINQ to SQL objects are delay loading an EntitySet at random places throughout our code. After futher looking into the issue, and testing our published application on various workstations, we have discovered that the application does work on one computer that has SQL CE version 3.05.5365.0000. It does not however work on any computers that have SQL CE version 3.05.5386.0000.

We are logging the SQL queries that the LINQ to SQL is generating and when we execute them in the the Visual Studio 2008 Query Analyzer, they run successfully.

Any ideas are appreciated as we have hit a dead end.

Thanks!

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Apr 30, 2001

I have a trigger on a table which when I do a direct update to throught QA seems to work fine. When a user developed application updates the record it locks their screen and record. I can't see where it could be causing it, but I am pasting it below. Any thoughts/comments greatly appreciated

CREATE TRIGGER tr_Patient_Updt2
ON patient_
FOR UPDATE
AS
if update(df_last_cholestero)
begin
declare @tstyears int
declare @tdate datetime
declare @sdate datetime
declare @bdate datetime
declare @ptage int
declare @actid varchar(12)

select @bdate = convert(datetime,df_last_cholestero,101), @actid = account_id
from inserted
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begin transaction
begin

if @tstyears < 12
begin
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end

else if @tstyears >= 12 and @tstyears < 24
begin
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update patient_
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where patient_.account_id = @actid
end

else if @tstyears >= 24 and @tstyears < 36
begin
set @ptage = @ptage + 3
set @sdate = DATEADD(year, @ptage, @sdate)
update patient_
set df_next_cholestero = convert(char(08),@sdate,112)
where patient_.account_id = @actid
end

else if @tstyears >= 36 and @tstyears < 48
begin
set @ptage = @ptage + 2
set @sdate = DATEADD(year, @ptage, @sdate)
update patient_
set df_next_cholestero = convert(char(08),@sdate,112)
where patient_.account_id = @actid
end

if @tstyears > 48
begin
set @ptage = @ptage + 1
set @sdate = DATEADD(year, @ptage, @sdate)
update patient_
set df_next_cholestero = convert(char(08),@sdate,112)
where patient_.account_id = @actid
end



end
end
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