Why Does SqlCeConnection.Dispose() Invoke GC.WaitForPendingFinalizers()?
Jan 30, 2008
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).
Given the following code:System.Data.SqlClient.SqlCommand sc = new System.Data.SqlClient.SqlCommand();sc.CommandText = "MySP";sc.CommandType = System.Data.CommandType.StoredProcedure;sc.Connection = new System.Data.SqlClient.SqlConnection("MyConnectionString"); sc.Connection.Open();sc.ExecuteNonQuery(); sc.Connection.Close();sc.Connection.Dispose();sc.Dispose();Is the call to sc.Connection.Dispose() necessary?J
I have an Execute SQL Task that returns a dataset to variable DfltValData. A dataflow follows that with a script component that access that dataset (read only variable) (see code below) and everything is fine. Now, after that, there's another dataflow with a script component, with the same code as below, trying to access DfltValData. Here is where the problem is, the DfltValData object does not contains any row. Whats happening and how to solve this?
Thanks!
Dim olead As New Data.OleDb.OleDbDataAdapter Dim dt As New Data.DataTable Dim row As System.Data.DataRow
i am using visual web developer 2005 and SQL Express 2005 with VB as the code behindi am using the following code to update the database table Dim update As New SqlDataSource() update.ConnectionString = ConfigurationManager.ConnectionStrings("DatabaseConnectionString").ToString() update.UpdateCommandType = SqlDataSourceCommandType.Text update.UpdateCommand = "UPDATE orderdetail SET fromdesignstatus = 2 ,progresspercentage = 15 , fromdesignlink = '" + designlink + "' WHERE order_id =" + ordersid.ToString() update.Update() update.Dispose() update = Nothing i am using update.Dispose() and update = nothing to release the memoryis it really necessary to use both the commandsif not , in my case which one is enough and what is the reasonplease help me
After making several hundred queries against a SQL CE 2.0 database (through NetCF/ADO.NET), I begin getting a SqlCeException: "Not enough storage is available to complete this operation."
Microsoft speaks to this situation in the following hotfix: http://support.microsoft.com/?kbid=827837
When I contacted them to receive the hotfixed ssce20.dll, they described the problem as SqlCeDataReader and SqlCeDataAdapter not releasing their memory resources after they went out of scope. In addition to using the hotfixed binary, they also advised me to call SqlCeEngine.Dispose() after every query to force SQL CE to release resources, as shown in the "finally" block of the code below.
I have a couple of questions about this:
(1) Will this cause a lot of performance overhead for me, especially if my application makes frequent queries using the following code?
(2) Can a cache an instance of SqlCeEngine and call Dispose() on that cached instance repeatedly, so I can avoid having to instantiate a new SqlCeEngine each time?
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'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 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.
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:
How to invoke a stored procedure "out of process", meaning i want to add it to a queue.
Reason: we have a proc that is fired real-time each time an order comes into the system and it take a few seconds and when there is plenty of order activity in the system, the process times out. I would like to essentially add this to a queue and move on and some other process will process from the queue. Is CLR call the way to do? I know that the easiest way can be to add to a table and process from the table every 5 mins or something like that. Thoughts?
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.
I have developed DTS package for various tasks and scheduled to run some time. I have included SQL Mail task to notify me for each process when it fails. The questions is, When I open the package and execute from the menu, it works and it notifies me through SQL Mail task when it fails but when DTS package invokes at scheduled time and it got failed but it did not notify me that process in between has failed. It seems like SQL Mail task does not work when i schedule the package. Is there any one did come across this situation? or is there any way to resolve this issue? Any help would be appreciated!
I want to creat an alert that will back up my database when the log files get to 90% full. When i try to create a new alert and select performance condition and select sqlserver:databases as the object then log file(s) Used size (kb) as the counter but when i go and select the instance i dont see my database in the drop down list but if I change to sql server event alert I see the database i want to use for this alert. I dont want to wait until the log is already full to back it up i want to do it when it hits a percent full. Is there a way to do this as a performance condition? thanks for your help!
Feeling really dumb tonight - below is my stored procedure and code behind which completes (it puts "completed" in TextBox4) but does not insert anything into database. Questions:1) do in need to include the primary key field in the insert stored procedure?2) do I need a DataAdapter to actually get it running and open and close the connection? STORED PROCEDURE running on SQL 2000 server: ______________________________________ CREATE PROCEDURE newuser003.InsertCompanyInfo @CS_CompanyName nchar(100),@CS_City nchar(500),@CS_Phone varchar(20) AS INSERT into tblCompanyInfo_Submit(CS_CompanyName, CS_City, CS_Phone)VALUES ('@CS_CompanyName', '@CS_City', '@CS_Phone')RETURN C# CODE BEHIND: ______________________________________________________ public partial class ContractorSubmision : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["localhomeexpoConnectionString2"].ConnectionString); SqlCommand cmd = new SqlCommand("CompanyInfoSubmit", con); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@CS_CompanyName", TextBox1.Text); cmd.Parameters.AddWithValue("@CS_City", TextBox2.Text); cmd.Parameters.AddWithValue("@CS_Phone", TextBox3.Text); TextBox4.Text = "Completed"; }}
hello everybody, i have a question to ask, suppose i have a sqldatasource, can i use it in a method??this is my case, i need to make a new method to count the rows in a datagrid, so i will have to read the sqldatasource. the problem is, how to retrieve it?? usually i use the built in sqldatasource_selected to count the rows.... is there any other way??
i have Smart Device with following Configuration :
Processor: ARMv4i OS: Window CE 5.0
I have installed SQL CE 3.0 on my Device.
When I try to make new database on my devcie using Qurey Analyser 3.0 , it gives "ISQLW Provider Failed... ". When I try Deploye SQL CE 3.0 Database Application using F5 in VS2005 , it give an error "Can€™t find P/Invoke DLL sqlceme30.dll".Plz tell me How can i resolve that problem.
Dear all, I'm trying to create a BLL for an objectdatasource to used for a sorted DataGrid. I am trying to learn about how to use LINQ and I'm sure this is a simple question. var query = (from p in db.MP3Collections select p).OrderBy(?????????);
Now I want to invoke the following method List<MP3Collection> GetAllMP3s(string sortColumns), which can contain a string name for the field in MP3Collection that is to be sorted (and optionally the "desc" tag). Now I'm resorting tocoding the query on a case by case basis, which is very tiresome (see the partial code below). This works fine, but is very long and tedious coding. I'm not sure how to go about neatening the code, though am sure it involves the ?????? space above. Any ideas? public static List<MP3Collection> GetAllMP3s(string sortColumns) {System.Diagnostics.Debug.WriteLine("Pure sort expression: " + sortColumns); bool descending = false;if (sortColumns.ToLowerInvariant().EndsWith(" desc")) { sortColumns = sortColumns.Substring(0, sortColumns.Length - 5);descending = true; }string[] columnNames = sortColumns.Split(','); MP3DataClassesDataContext db = new MP3DataClassesDataContext(); List<MP3Collection> query = (from p in db.MP3Collections select p).OrderByDescending(p => p.fileName).ToList<MP3Collection>();foreach (string columnName in columnNames) {switch (columnName.Trim().ToLowerInvariant()) {case "filename":if (descending) { query = (from p in db.MP3Collections select p).OrderByDescending(p => p.fileName).ToList<MP3Collection>();System.Diagnostics.Debug.WriteLine("Sorting filename descending"); } else {query = (from p in db.MP3Collections select p).OrderBy(p => p.fileName).ToList<MP3Collection>();System.Diagnostics.Debug.WriteLine("Sorting filename ascending"); } break;case "filepath":if (descending) { query = (from p in db.MP3Collections select p).OrderByDescending(p => p.filePath).ToList<MP3Collection>();System.Diagnostics.Debug.WriteLine("Sorting filepath descending"); } else {query = (from p in db.MP3Collections select p).OrderBy(p => p.filePath).ToList<MP3Collection>();System.Diagnostics.Debug.WriteLine("Sorting filepath ascending"); } break; //OTHER CASES HEREdefault: query = (from p in db.MP3Collections select p).OrderBy(p => p.filePath).ToList<MP3Collection>(); //throw new ArgumentException("SortColumns contains an invalid column name.");break; } }
//var query = (from p in db.MP3Collections select p).OrderBy(p=>p.fileName).ToList<MP3Collection>();return query; }
Anyone help me. Now we can do Invoke SSIS Package into ASp.NET.
Vice versa
Is there Possbile to invoke Datastage (oracle Job) into ASp.net? . Is already created in Oracle DataStage Server. it call or access through Dot net. Is it possble? Please any one help me.
I am aware of the many posts that have addressed this issue in the past - I resolved this issue many months ago when it first happened to me. However, I have recently created a headless version of my Windows CE 6.0 based project that uses the Headless versions of the Compact Framework and this problem has suddenly re-surfaced. As in my UI equipped versions, the SQL CE cab files are copied to the device and have been installed. I have also tried copying the sqlceme35.dll to the application folder. The only real difference I can see is that the device is using the headless version so I suspect that there may be some incompatibility.
Has anyone successfully deployed a SCQL CE aplication to a headless device and if so were there any special steps that had to be taken to make it work?
Until now we worked with SQL Server 7.0, now we're migrating to SQL Server 2005.
With SQL Server 7.0 we had an MS Access application (located on a file server) used by several users, from which's form a batchfile (located on the same server) can be started. The Batchfile deletes an existing TXT-file called import_result.txt, then invokes a DTS-Package (located on a SQL Database server) which imports data to the Access-DB and creates a new file with the result of the DTS-execution (again called import_result.txt). Like that the user gets some information about success (or failure) of the data import.
How could this be implemented with SQL Server 2005 without having to install (and to licencse) SQL Express Engine on the clients? I found some threads about how to invoke an SQL Agent Job from the client to execute the SSIS-Package on the server, but I think that's not exactly what we need. Besides I'm not quite sure how exactly the SQL Agent Job could be invoked from Access.
