Null Reference Exception During Synch (can't Trap With Try-catch)

Mar 12, 2007

Dear all,

I am running into a null reference exception on replication with SQL Server 2005 Compact Edition. The problem occurs at repl.synchronize(). Even though the statement is inside a try-catch block, the exception is not caught, and the application quits.

Device O/S: Windows Mobile 5.0 v 5.1.195 Build 14957.2.3.1
Hardware: Dell Axim X51v, Intel PXA270
Database: SQL 2005 SP2 (no post SP2-patches)

Exception shows as "an unexpected error has occured in AppName.exe. Select Quit and then restart this program, or select Details for more information." Details:
.. at NullReferenceException at AppName.Form1.Synch()
.. at .... (various lines)
.. at AppName.Form1.Main()

The application is based on the tutorial (Creating a Mobile Application with SQL Server Compact Edition) at http://msdn2.microsoft.com/en-us/library/ms171908.aspx.

The application was successfully working initially but then stopped working on replication after some minor modifications which were not related to the replication code, e.g. adding some buttons to the form.

Three things are puzzling me here..

1. The fact that this is a NullReferenceException and not a SqlCeException
2. Why the try-catch block doesn't work
3. Why the exception occurs

Is this a bug or am I doing something wrong here?

Any help would be appreciated.



Code sample below:

Sub Synch()
Try
LogMsg("Deleting db...")
DeleteDB()
LogMsg("Initializing repl...")
Dim repl As New SqlCeReplication
repl.InternetUrl = http://192.168.0.100/SQLMobile/sqlcesa30.dll
repl.Publisher = "TRKSRV"
repl.PublisherDatabase = "trk_db"
repl.PublisherSecurityMode = SecurityType.NTAuthentication
repl.Publication = "Trk"
repl.Subscriber = "Trk"
repl.SubscriberConnectionString = "Data Source=""Program FilesTrk2007DefectTrk.sdf"";Max Database Size=128;Default Lock Escalation =100;"
LogMsg("Adding subscription...")
repl.AddSubscription(AddOption.CreateDatabase)
LogMsg("Synch...")
repl.Synchronize()
LogMsg("Cleanup...")
repl = Nothing
Catch err As SqlCeException
MessageBox.Show(err.ToString & " " & err.HResult & " " & err.NativeError & " " & err.Message & " " & err.InnerException.ToString)
Catch err2 As Exception
MessageBox.Show(err2.ToString & " " & err2.Message.ToString & " " & err2.InnerException.ToString)
End Try
End Sub

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The value of c will always be zero, if there were any errors during the execution of the stored procedure. The DataSet does not get filled, even though the stored procedure is returning a result set. This is a problem for me because I expect errors to occur, and I need to know which records from the Xml caused those errors.

Is there any way to clear the errors in my stored procedure so that they don't turn into exceptions in my code? Or, is there anyway to get the Adapter to fill the DataSet regardless of any errors that were encountered?

I've also tried this with a SqlDataReader. The reader never gets assigned to because SqlCommand.ExecuteReader() throws an exception.

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HELP US MICROSOFT: SYNCH BETWEEN SQL EXPRESS AND SQL MOBILE

Mar 28, 2006

Hi Everyone

As most of you do, I am eagerly awaiting the ability to synchronize my sql mobile database on the hand held to a local sql express database on my local machine

I know users in Microsoft have pointed out to us that we are getting things for free.

At the same time, Microsoft is getting our patience for free and at a cost to us developers.

Its nearly April and as one article says Microsoft will release a fix for this inadequacy

Microsoft...we are happy to pay for this. Palm offers it so what is the big deal. Its not the

reinvention of the wheel. We would have liked that instead of the server synchronization

that bypasses the local sql express database

I as many others are happy to pay

Please let us know when you will be addressing this problem.

I would appreciate the feedback and frustration of other developers. Maybe this will show them we are really running out of time with our clients

Regards

Touraj

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Sql Server 2005 User Synch

Jan 30, 2008

Hi ... I am converting SqlServer 2000 databases to SqlServer 2005. It is working great for the most part.
The issue I am having is that a user with a schema that owns objects is established in the database and no user is defined in the instance logins. I can see where if I add the instance login then the Principal_id does not match. Cannot drop the user/schema as there are referenced objects.

I got around this in SqlServer 2000 by updating the IDs to match but now they are views and updating is not allowed.

Is there a straightforward way to resynch the database user to a newly created login?

Thanks,
John

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Jan 29, 2007

I have an SSIS package that fires an OnTaskFailed event whenever any of my tasks fail.
I would like to put any SSIS task failure message into a user defined variable.
Any idea how to do this?
Any help appreciated.
Regards,
 Paul.

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Feb 9, 2006

Hi All,

I have a database with primary and Unique key contraints on SQL Server 2000. I'm front ending it with Access 2k.

I want to trap the error when the Unique key constraint is hit, but i can't capture the error number. All attempts return error 0.

The error i get is
[Microsoft][ODBC SQL Server Driver][SQL Server]Violation of UNIQUE KEY constraint 'IX_lut_Referral_Source'. Cannot insert duplicate key in object 'lut_Referral_Source'. (#2627)[Microsoft][ODBC SQL Server Driver][SQL Server]The statement has been terminated. (#3621)

I've tried the soultion given here http://support.microsoft.com/kb/q185384 but now get a Type mismatch error on errStored

SaveRecODBCErr:
' The function failed because of an ODBC error.
' Below are a list of some of the known error numbers.
' If you are not receiving an error in this list,
' add that error to the Select Case statement.
For Each errStored In DBEngine.Errors

Thanks for your help

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