I'm connecting to an ftp server in my .net application. After I send the file and try to close the connection, I'm getting an error. I'm trying to send the Quit command to the FTP server but getting no reply. I'm not sure what I'm doing wrong. I call this method: [code] Do you think something is wrong with the code of could it be a problem with the ftp server?
View 2 RepliesWhen it comes to database connections what is the difference between closing a connection & disposing a connection? I'm hoping to gain a more technical understanding of what happens when each is called & the effect on the database.
View 5 RepliesI have many Listviews in my Form and Im retrieving stored procedures to populates my Listviews. Is it necassary to close the connection to SQL Server once I have finished populating my Listviews?The angle which im coming from is that every 30 seconds or so I need to re-populate my Listviews with the latest cut of data from SQL Server therefor Im probably going to slow down my application if it has to connect to SQL Server every 30 seconds to get the latest cut of data... instead of keeping the connection to the SQL Server Stored Procedure live so that I can use some sort of method to refresh the data?
View 2 RepliesIs it necessary to close the connection of a tcplistener or tcpclient after every message received, or is it possible to close it at a later time while it continues to receive data? Is there any major security issue with leaving it open and listening? I know trojans tend to open a listener and leave it open, will my program be detected as such? Its just a simple chat program....
View 1 RepliesI'm writing a Windows form application in VS 2008. In the application I need to move among several SQL express databases (.mdf). I'm using the following commands to change the connection:
Me.MyTableAdapter.Connection.Close()
Me. MyTableAdapter.Connection.ConnectionString = "NewString"
Me. MyTableAdapter.Connection.Open()
I can see the form is showing data from the 2nd database. However, When I tried copying the 1st database (for a Save as function I'd like to implement), I got a system error saying "Cannot copy MdfFile: It is being used by another person or program.". Actually, I found all the visited databases were "being used" untill I closed my application. How do I break the connection completely?
I get this error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*' at line 1 [Code]
View 14 RepliesI've got a fairly large VB.NET (3.5) project that makes a lot of database calls. So I created a namespace/class just to handle those fuctions. The idea was that this single point of entry into the database would give more control over validating input from users.
So my class looks something like this. (I've chopped some code out for readability, it works just fine except for all the open connections.
[Code]...
So I can close the data reader, but how do I reach back to that original database class and close the connection. If I close it in that original class it will bomb when I try to loop through the data reader the in calling class.I'm sure this is probably pretty obvious but I'm fried from the keyboard.
When connecting to a Sybase ASE database via ODBC using the code below, I'll occasionally get a '[IM006] [Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed' error. this be caused by my code? I read here that I should be using the 'With' statement instead, but I don't understand how that would affect this.
[Code]...
Finally starting some coding in VB.Net, I notice over the years, that we can say (in VB6)
Code: Dim MyForm_Stock as NEW frmStock
in the same session, being able to open, say 3 Stock Forms at the same time and maintain details independently of each of the other forms. Also am I able to maintain separate Database connections and the same table being opened and updated independently of each other by each separate form. What is actually taking place in terms of memory being used by each process? My ultimate goal is to be able to have ONE Module with all the possible data Connection and Recordset Opening and closing options, which I have failed miserably to do in my VB6 experience. Data access is an obvious module based set of subroutines. Others could be Date routines eg, Week Number of the year, Days Diff, Days to, etc. [Code]
I am slightly confused on how a form should be closed. I have an exit button and have always done me.dispose in the click event. I just found out this causes the formclosing and formclosed not to be triggered. I found this out because I was updating the live database in the formclosing. Because of this I used me.close but this does not free up all the variables. Do I have to do me.close and then in the formclosed me.dispose in order to close a form correctly?
View 7 RepliesI have been requested to add a pop up form when the user chooses to quit the application.The form needs to stay visible until the application is finished with all its clean up code and then close down.
View 2 RepliesI'm currently coding a program where I would like a dialogbox (with answers OK and Cancel) to essentially 'fake' a clicking of Cancel after 10 seconds.I've got the timer working, but I'm not sure how I'd go about actually cancelling the form in a different subroutine.
[Code]...
I have a project using Application Framework and then a main form which displays the main UI. There's another form I call it frmLog, which is solely used for logging any operations internal message logging. By default, I created a Global MyApplication logging object called myLogger which is an object of type frmLog. In Application_StartUp, I instantiate it by myLogger = New frmLog. On the main UI form, there's a button Show Log which does myLogger.Visible = Not myLogger.Visible.
[Code]...
What I wanted to do is close all opened workbooks. This code does the work IF there is at least one or more opened workbooks. My problem is IF there is NO opened workbook at all; It goes around unendlessly in the WHILE Loop. How do I not process the closing IF there is no any opened workbook at all? (NOTE: I found this code from somewhere else.)
[Code]...
I have created a splash screen and it fades in. When the splash screen closes, the main form (MDI) should open. The main form opens but then immediately closes.
vb
Public Class frmSplash
Private Sub frmSplash_FormClosing(ByVal sender As Object, _
ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
'Open the MDI form.
frmMain.Show()
End Sub
[Code] .....
Attach and detach sql 2005 database
View 1 RepliesI made a Vista Aero -style form for XP, but when using it, the application won't close. The FormClosed and Disposed events fire, but not the HandleDestroyed event. I tried to get around that by handling the Disposed event and calling Me.DestroyHandle(), and it worked, but not if the user resized the form so that it caused an IndexOutOfRangeException in BlurImage().The code is attached.
View 2 RepliesForm1 is a mdi container. It has a bunch of forms that can load inside of it as mdi children. If I close each open form inside the form1, and then click the red X at the top right, application exits fine.If I click the red X without closing the forms inside I get: An unhandled exception of type 'System.CannotUnloadAppDomainException' occurred in mscorlib.dll
Additional information: Error while unloading appdomain. (Exception from HRESULT: 0x80131015) However I can break from it. How do I get the application to not show that error? What must I do to fix those inside forms or close when the red x is clicked?
Dim frm As Form
For Each frm In Forms
Set frm = Nothing
Next frm
The above code is what I used in VB6 to close all forms associated with my programs before my program closed. I have been searching for information on how to make sure all forms are closed when closing a VB2008 program.
I have seen info on using the Project Property Shutdown mode When startup form closes and I currently have this set.
Is this all that is really necessary? Will the garbage disposal close everything else to free up RAM?
Also, if I have several forms open and want to close all from the main form without closing each one individually, what is the best approach? Is there a collection like in VB6, go through the collection, compare it to the name of the main form and close it if it is not the main form?
I have compiled a Vb.Net program in which I used R Programming through R(D)COM. The statconnector library works fine. The program gives output without any error.
However whenever I try to deploy the code and create a setup file, and I run the setup file, I get the following error: There is connection for this connection ID (Exception from HRESULT: OLE_E_NOCONNECTION)
I have the following code to close a form which is a child. The problem is that when it closes, it closes the MDI parent too.
Private Sub frmTransaction_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
If ListView1.Items.Count >= 1 Then
[Code]....
i am trying to run a stored procedure from my vb .net application and i am getting an error that says something like this:
"..under default settings sql server does not allow remote connections"
i have checked with my sql configurations and i have allowed remote connections but i am getting this error. besides i am connecting to my local machine so why should it give me a remote connection error.
I making a connection through word 2003 VBA to SQL server 2005 using the following codeDim cn As ADODB.ConnectionSet cn = New Connectioncn.ConnectionString = "Provider=SQLNCLI;Server=LEXAE29150SQLEXPRESS;" & _"Database=MCarter.mdf;Integrated Security=SSPI;"cn.openetc.cn.close.All runs fine up to cn.open.I then get the message error 'Cannot open database "MC.dbf" request by the login. The Login failed'.Tryed websearching but no succes. Been on it a week and the boss is doing his nut. I'm lost and unsure what wrong.The SQL server is set for windows authenticity and SOL Server login.In the MC database under security users my user name (Login) is their and setup as owner and sysadmin.SQLServer is running on the same machine as the word.dot.
View 3 RepliesI wrote a program in Visual Basic 2008 on my laptop that runs windows vista 64 bit, well the program attempts to access an Sql server that I am running on my laptop and it continues to give me the following error:
[Code]...
I get a Type 'System.Data.SqlClient.SqlDataReader' has no constructors. error on the 5th line of code below and I get a Variable 'e' hides a variable in an enclosing block. on the last line of code below (in my catch statement).
Here is my code:
Imports System.Data.SqlClient
Public Class Form1
Dim myConnection As SqlConnection
[code]....
I have a an application that opens a SQL connection and over the course of a few hours creates and disposes of tens of thousands of DataReader objects. You could look at it as just one big loop. As the time goes by, the memory usage steadily climbs until the application/system runs out of memory and crashes.
Psuedo code would look something like
SQLConnection.Connect
Do Until x =1000000
Create New DataReader
Use DataReader
Close DataReader
[Code] .....
Even though I dispose of the DataReader object when I am done with it, the memory usage keeps climbing. I found that every time I am finished with the DataReader I have to close the SQLConnection and dispose of it. When I do that it keeps the memory usage very low and the processor usage is barely noticeable. I would think I could just open the SQL connection once and close it when I am done.
Between ODBC and OLEDB providers, which one is more flexible at both the application level, and at the report level using crystal report?
View 1 Replieshow to code for database connection in vb.net 2005?
View 3 Replieshow to code for database connection in vb.net 2005?
View 1 RepliesUsing - VB2008 Express, XP Pro,
Connecting to SQL 2005 across the internet
The walk throughs have several good explanations although I don't see any about connecting over the internet.