Problem In Reading The Line Public Mycon As New Sqlceconnection
Feb 19, 2008
Hi Frndz
I am facing a problem with vb.net application which i created to connect with and sqlservermobile edition file (.sdf).
while the connection is declared, its producing the error that "Exception from Hresult : 0x4007000B." and some inner exception error lines.
i imported system.data.sqlceserver and added the references too.
but It is working in my one of the system. i tried the same in some other system,its not working. you frndz have any about this. I think the system is lacking some dll files. any body having an idea about this. pls help me out.
What is exactly the recommended way of using a SqlCeConnection object in your application?
In all the examples I see (IBuySpyDelivery for example) it opens the connection object in the constructor and leaves it open most of the time until the class gets disposed.
Is that the way to do it? Or should you open and close the connection for each database action (insert/select/delete) you're doing on the local SQL Mobile database?
I'm a bit confused, but maybe I'm messing up the way of working on remote database servers with how it should be done on a local SQL Mobile db.
I am trying to implement a web service that creates and populates a SQL Mobile database file, then returns the created database to a mobile device as a byte array. The database size could be in excess of 500,000 rows, which is why I want to do as much of this preprocessing on the server before it gets to the mobile device. I can't use replication since I have to do some shaping of the data before I can use it on the mobile device.
Unfortunately, the web service is throwing the following exception when I try to instantiate a SqlCeConnection object:
"System.NotSupportedException: SQL Server Everywhere Edition is not intended for ASP.NET development."
Are there any suggestions as to how I can get around this potential limitation? If I refactor out the code that actually performs the SqlCe operations to a separate assembly, but still call that assembly from within the ASP.NET process, will I get the same error?
I know that you can work with Sql Mobile databases from the deskop, and I suppose I could invoke a console application to create the database, but that seems like such a hack.
Hi, there; I have a couple of issue that really frustrates me. I asked a similar question before but I haven't resolved it yet. My application was developed with VS2003, c#,CF1.0,Sp1.
I found that after my application runs for a couple of hours, my SqlCeDataAdapter.Fill() method throw exception "Error Code: 8007000E Message : Not enough storage is available to complete this operation.". I found a couple of threads on the website said that I have to dispose adapter object (including its command objects.) Yes, I did!!!. And I also dispose my SqlCeConnection before it is out of range and recreate it when I need it. See:http://www.tutorials-se.com/sqlserverce/Keeping-SqlCeConnection/
I also introduced hotfix from http://support.microsoft.com/Default.aspx?kbid=827837. It looks like I tried everything, but I still has this exception.
At the same time, From thread "http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=426640&SiteID=1", Mr. Ilya said "native DLL (e.g. bar code scanner API) " could cause AV (access violation) issue. Yes, my application is running on Symbol 9062B device which use barcode scanner API, sometimes application will have "0xc0000005" exception when it exists (not when it is running) A serious problem is that the laser randomly crash in the middle of the scanning without any exception. I am quite sure it is not code logic issue. This happens since I introduced two SqlCeConnections which point to two different .sdf files (run at background threads). My impression is that the memory or stack are corrupted for some reason.
Hopefully I make myself clear. So my question is: 1. Will Sp3 help this? (Of course I will do some test) 2. How can I know memory or stack are corrupted/How to trace.
Again, thanks Mr.Ilya, you do a great job here, you are really really helpful!
I've got an application uses a WPF GUI, is built in VS2008 final, targets .Net Framework 3.5, and uses a Sql Ce 3.5 database for local storage. After a specific WPF window is rebound the application hangs. Hitting pause on the debugger reveals the offending method is a call to SqlCeConnection.Dispose(). Via Reflector I can see this method calls SqlCeConnection+ObjectLifeTimeTracker.Close() which in turn calls GC.WaitForPendingFinalizers(). Within WPF there are some objects (specifically TextBox) which need to have their resources freed on the main application thread. The finalizer thread is waiting on the main application thread, which is in turn waiting on the finalizer thread, resulting in a deadlock.
You can see some additional discussion of the topic including our temporary resolution in this thread.
My question is why is there a call to GC.WaitForPendingFinalizers() buried within the SqlCeConnection.Dispose() call tree?
public void Dispose() { if (this.connection != null) { this.connection.Dispose(); } } // ... }
This only happens when I'm calling Application.Exit(); and Dispose is called through the destructor of the DatabaseManager class. When I'm disposing the connection during normal work the call works as intended. BTW I'm using SQL Server Mobile 3.0.5214.0 on a PPC 2003 AKU2 (Symbol PPT8846 industrial device).
I'm having a problem where I am getting a "Permission denied" exception when I call Open on a SqlCeConnection object using SqlCE version 3.5. It does this when mode is set to Read Only in the connection string. Furthermore it does this on XP, but not Vista. Here is the connection string I'm building:
I am developing a program on Visual Basic 2005 to a pocket pc, I want to make the SQLceconnection but It says that the file doesn´t exists, I use this code:
I know that with traditional SQL systems, it is important to only open connections to a sql server when they are needed. However, since there is no "server" in mobile apps, is it bad practice to leave one open throughout the duration of an application?
The application is going to be constantly reading and writing to the data tables and it seems like it might be a good idea to leave it open.
I am trying to access my SQL Server database through SqlCeConnection:
cecon = new SqlCeConnection("Data Source=D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf");
cecon.Open();
I am getting the following error:
System.Data.SqlServerCe.SqlCeException was unhandled Message="The path is not valid. Check the directory for the database. [ Path = D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf ]" HResult=-2147467259 NativeError=25009 Source="SQL Server 2005 Mobile Edition ADO.NET Data Provider" StackTrace: at System.Data.SqlServerCe.SqlCeConnection.ProcessResults() at System.Data.SqlServerCe.SqlCeConnection.Open() at System.Data.SqlServerCe.SqlCeConnection.Open() at nddbpda.frmCeMain.frmCeMain_Load() at System.Windows.Forms.Form.OnLoad() at System.Windows.Forms.Form._SetVisibleNotify() at System.Windows.Forms.Control.set_Visible() at System.Windows.Forms.Application.Run() at nddbpda.Program.Main()
When I tried to get the path from which the database file is being accepted, I got a different path:
I am trying to access my SQL Server database through SqlCeConnection:
cecon = new SqlCeConnection("Data Source=D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf"); cecon.Open();
I am getting the following error:
System.Data.SqlServerCe.SqlCeException was unhandled Message="The path is not valid. Check the directory for the database. [ Path = D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf ]" HResult=-2147467259 NativeError=25009 Source="SQL Server 2005 Mobile Edition ADO.NET Data Provider" StackTrace: at System.Data.SqlServerCe.SqlCeConnection.ProcessResults() at System.Data.SqlServerCe.SqlCeConnection.Open() at System.Data.SqlServerCe.SqlCeConnection.Open() at nddbpda.frmCeMain.frmCeMain_Load() at System.Windows.Forms.Form.OnLoad() at System.Windows.Forms.Form._SetVisibleNotify() at System.Windows.Forms.Control.set_Visible() at System.Windows.Forms.Application.Run() at nddbpda.Program.Main()
When I tried to get the path from which the database file is being accepted, I got a different path:
I am writing an application using VB.Net 2005 for the Windows CE 5.0 device and it is connecting to a SQL Server 2005 Mobile Edition Database. The trouble I'm having is establishing a connection to a SQL Server Mobile database on the device.
Here is the code I am using:
Code Snippet Public gConnectionString As String = "Data Source=Program FilesMobAppMobDB.sdf;Persist Security Info=False;"
Code Snippet
Imports System.Data.SqlServerCe
Public Class DBManager
Public Shared gSQLCEConnection As SqlCeConnection
Public Shared Function OpenDB() As Boolean
If gSQLCEConnection IsNot Nothing Then
Throw New InvalidOperationException("Connection already open.") End If gSQLCEConnection = New SqlCeConnection(gConnectionString) Try
gSQLCEConnection.Open() 'Error occurs here Return True Catch ex As SqlCeException
MsgBox(ex.Message & vbCrLf & ex.HResult & vbCrLf & ex.NativeError & vbCrLf & ex.Source) Return False End Try End Function
In the immediate window I recieve the following messages:
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
A first chance exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.SqlServerCe.dll
I believe that the first few lines are caused by the icons/pictures that I have included with my app, but the SqlCeException line occurs when the connection to the .SDF file is trying to be established.
Here is the exception output:
Message: "" (Blank) HResult: -2147024882 NativeError: 0 Source: SQL Server 2005 Mobile Edition ADO.NET Data Provider
Programs under Remove Programs on the PDA are: Microsoft .NET CF 2.0 ENU-String R... Microsoft .NET Compact Framework... Microsoft SQL Client Microsoft SQL Mobile 2005 Microsoft SQL Mobile 2005 [EN] Microsoft SQL Server 2005 Compact... Microsoft SQL Server 2005 Compact... Microsoft SQL Server 2005 Compact... Microsoft SQLCE 2.0 Microsoft SQLCE 2.0 Dev
Any ideas on what could be stopping this connection from being established? It was working before but all of a sudden just stopped. I have warm booted, cold booted, and rebuilt with no luck and also checked that SQL Query Analyzer is not running on the PDA and that the connection string is valid. The call to OpenDB occurs in the form_load of the startup object.
Hi, for some AP issue, the file I upload must be without the line feed/carriage return in the last line. for example:
original fixed-length file (exported from SSIS) line NO DATA 1 AA123456 50 60 2 BB123456 30 40 3 CC123456 80 90 4 <-- with line feed/carriage return in the last line
The file format that AP request. The file only has 3 records, so it should end in the third line. line NO DATA 1 AA123456 50 60 2 BB123456 30 40 3 CC123456 80 90
Should I use script component to do it ? I am new for VB . Anyone would help me ?
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This is the link [URL] ....
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I hope I'm posting this in the correct forum (forgive me if I'm not) since I'm not sure if this is an issue with inserting an item into a db or the processing of what I get out of it. I wrote a basic commenting system in which someone my post a comment about something written on the site. I wanted to keep it very simple, but I at least want the ability for a user to have newlines in their comment without having to hardcode a <br /> or something like that. Is there a way for me to detect a newline if someone, for example, is going to their next paragraph? Let me know if you need a better explanation. Thanks in advance!
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