Hi, there;
If I create a SqlCeDataAdapter object like this:
SqlCeDataAdapter adapter = new SqlCeDataAdapter(Utility.StrSelectStatement,conn);
where: Utility.StrSelectStatement is a static string;
conn is SqlCeConnection object.
Now I want to dispose this adapter object:
adapter.Dispose()
Can this "adapter" be disposed properly here? I ask this because I use that static string to create that adapter.
Cheers
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
View 5 Replies View RelatedI 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
olead.Fill(dt, Me.Variables.DfltValData)
For Each row In dt.Rows
.
.
.// read value from row.
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
View 3 Replies View RelatedI'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?
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?
SqlCeConnection conn = null;
try
{
conn = new SqlCeConnection(connectionString);
dbCmd.Connection = conn;
dbCmd.Connection.Open();
dbCmd.ExecuteReader(CommandBehavior.CloseConnection);
<use the reader>
}
finally
{
dbCmd.Connection.Close();
// Add the following code to release resources?
SqlCeEngine engine = new SqlCeEngine(connectionString);
engine.Dispose();
}
Hi,
I'm having the problem that my application hangs on SqlCeConnection.Dispose() when I'm closing the app.
public class DatabaseManager : IDisposable
{
private DbConnection connection = null;
// Singleton
private DatabaseManager()
{
this.CreateConnection();
}
~DatabaseManager()
{
this.Dispose();
}
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).
Thanks for support,
Klaus
Hi,
I am trying to make a mobile application work, but I get the following error. The operating system on Pocket PC is Microsoft® Windows Mobile„¢ 2003 Second Edition. Any ideas? Thanks in advance.
The followings are the error and my codes:
System.TypeLoadException was unhandled
Message="Could not load type 'System.Data.SqlServerCe.SqlCeDataAdapter' from assembly 'System.Data.SqlServerCe, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91'."
StackTrace:
at SQLMobile.Form1.Form1_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 SQLMobile.Form1.Main()
Codes:
Private Sub FillGrid()
Dim filename As New String _
("Program FilesSQLMobilesqlmobile.sdf")
Dim conn As New SqlCeConnection("Data Source=" + filename)
Dim selectCmd As SqlCeCommand = conn.CreateCommand()
selectCmd.CommandText = "select Destination from flightdata"
Dim adp As New SqlCeDataAdapter(selectCmd)
Dim ds As New DataSet()
adp.Fill(ds)
DataGrid1.DataSource = ds
End sub