Multiple Instances Of Sqldataadapter, Single Transaction?

Jun 22, 2010

i want to put multiple instances of sqldataadapter into a single transaction. how can i accomplish this?

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Multiple Stored Procedure, Single Transaction?

Jun 22, 2010

i get an "This SqlTransaction has completed; it is no longer usable." error everytime i run my code:

the main code

If DBOpen() = True Then
Try
'begin transaction

[Code].....

i specified the transaction of sqlcommand named cmd via the Public Sub BeginTranscation. but, is this correct?

also, the error points to the Public Sub RollbackTransaction if the insert to the stored procedure fails. : "This SqlTransaction has completed; it is no longer usable."

how can i perform multiple stored procedure calls within a single transaction correctly?

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Single Form With Multiple Instances

Aug 12, 2010

I have a form which displays temperature and humidity data for a device in the field. I have multiple devices. Rather than creating a separate form for each device, obviously it is much better to have a single form that I instantiate, pass data to, and display. The devices are listed in a treeview, and when the user double-clicks the node, I create an instance of the form, pass the device's data to the instance of the form, and display the form. All of this works perfectly. However, I have a challenge: If the form for a particular device is already open, I don't want another one opened when the user double-clicks the node.

However, whenever I place logic in the program to check for the existence of the form and only allow another instance to be created if one doesn't already exist, it prevents me from creating a form instance for any other device that I may wish to view, simultaneously. So, I have a dilemma -- allow the user to display the data for multiple devices, including allowing multiple forms to be open for a single device, OR only allowing one device to be displayed at any given time.

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Multiple Instances Of A Single Control On A Form

Apr 6, 2012

I've got two sets of lists with nearly 800 items that I need in 32 different drop down comboboxes (before you ask, that is required and it can't be simplified). Understandably, populating each of them slows down the creation of the form. This happens to be a child form that these drop downs are on and there could be more than one child form displayed. I've assembled the lists in List(Of String) objects and set each of the datasources of the comboboxes appropriately, but it still takes several seconds for them to populate and display for the first time. This is also problematic if the datasource gets updated (items removed, added, renamed) because I have to wipe out all the items and create the list again in all active instances.

[Code]...

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Single Instance Application Won't Load Multiple Instances

Dec 13, 2008

I have set the "Make single instance application" check box.And when my application version is 1.0.0.0 for example, it is OK and won't load multiple instances.But when I create a new version, for example 1.0.0.1, then I can run 2 instances of my application, when the 1st instance is 1.0.0.0 and the second instance is 1.0.0.1.What should I do to prevent this?

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Using Instances Of Multiple Classes In Single File Without Recursive DB Calls?

Feb 3, 2011

2. FunctionLayer -deals with Common Operations which get results from DataLayer and return results to Forms.3. User - deals with User. (For Reusing the User Class in other projects, i have separated this class)Here in Class2 - I have an instance of Class1( ie., DataLayer) for DB Operations.imilarly in Class3- I have an instance of Class1( ie., DataLayer) for DB Operations.Now in my form, If i create Instance of Class2. But When I need user functionality in this form, I have to create an instance of Class3 to this form.

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Sql - Get Multiple DataTables From A SqlDataAdapter?

Apr 21, 2011

I'm not even sure what I'm asking is even possible, but here goes:

Is there a way to loop through a sqlDataAdapter to find multiple tables?

Currently I have a module that you pass in an object and it automatically fills the parameters of a stored procedure with the values of the object. It works great, except when the stored procedure returns more than one table, it only returns the first one.

Here is what I tried to get to that second table:

Dim ds As New DataSet
Dim table As New DataTable
Dim reader As SqlDataReader = command.ExecuteReader

[Code].....

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Oracle Transaction - Rollback Your Transaction If You Haven't Commit The Transaction

Oct 31, 2011

I want to know that do you still need to rollback your transaction if you haven't commit the transaction that was created earlier.

[Code]...

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Asp.net - Verify Existence Of Two Columns In Different Tables In A Single SQL Transaction

May 31, 2012

I'm trying to verify if data exists in two different tables in a single transaction. The reason for the single transaction is the database gets hit about 1-3 million times a day so adding anymore than 1 extra transaction would increase that number up to 9 million, and my poor little server needs a break :)

So I need to check if an ID exists in table X and table Y and return the results to my VB.net script so I can handle the outcome Ideally something like this would work

if exists (select id from X where id = @id)
print 'True,' else print 'False,'
if exists (select id from Y where id = @id)
print 'True' else print 'False'

Which gives me "True, True" if exists in both or "True, False" etc etc... But that only displays in SQL print and not actually returning it as an object/string or array values that I can use.

I'm open to any sort of solution of this nature that can give me two results from a single transaction and how to handle that response in vb.

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Insert SQL 2008 Parent And Child Rows In A Single Transaction?

Nov 13, 2010

First, a little background (greatly simplified): I have two classes, one called Entity and one called Item which a subclass of Entity. They each store their individual properties in seperate SQL 2008 tables using TableAdapters generated by a strongly typed DataSet. The Entity class has a Save() method that looks like this:

Public Sub Save()
entityTableAdapter.Update(entityRow)
End Sub

[Code]....

Indeed, the SQL table does not contain a row in the Entity table with the necessary ID at this point because the transaction is not complete.

My goal is to prevent the Entity record from being inserted if inserting the Item record fails. I could write code to delete the Entity record again, but this does not seem very elegant to me...

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Setup A Single Handler For All Instances Of An Event?

Sep 8, 2011

Is there a way to code a common handler for every instance of an event? I am trying to display the .text property of a control in the status bar on MouseEnter.

Private Sub DisplayMenuText(ByVal sender As Object, ByVal e As System.EventArgs) Handles ?.MouseEnter
tsslStatus1.Text = sender.ToString
End Sub

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Is Running Multiple Threads Faster Then A Single Thread On A Single Core Cpu

Dec 23, 2009

Say I have a code with 3 methods that do some pretty intensive work. Would executing these methods on 3 seperate threads be faster then executing them one after the other on a single core cpu? And what if it's a dual core or HT?

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Using Transaction In Multiple Functions?

May 24, 2010

I'm trying to use transactionscope to maintain database consistent. But I'm getting error ('Already enlisted'). I'm using transactionscope in multiple functions. I'm trying to do something like this

Private Function RootMethod() As Boolean
Using scope as New Transactionscope
'Connecting & executing query.

[Code].....

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One Big Transaction Or Multiple Small Transactions?

Dec 22, 2011

whether is it feasible to commit one huge transaction per time or do it multiple times.Lets say around 1000 - 3000 of mixed updating or inserting rows for per transaction or having a loop to commit every transaction as it loops.Which one is preferred ? will it have any impact ?

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Connecting To Multiple SQL Instances?

Jan 3, 2011

Any best method of managing multiple SQL connections .net (VB). My application connects to four instances of SQL Server (2000, 2005, 2008, 2008R2) restoring databases, modifying data and taking backups. In addition to managing databases the app also has its own DB (on the 2008 instance) for storing various data. I'm using two methods to connect to the instances, SMO (For backups, restoring and retrieving information about the databases, size etc) and SqlClient for querying each database for many tasks such as updating fields and executing sql scripts.I have multiple forms for performing various tasks so there are many places I'm opening / closing connections.

Would it be best to maintain a persistent global connection to each instance from the application? (Two in total, one for SMO and the other for SqlClient) or open close a connection for each task I'm performing?) I'm not using LINK as I need the tasks to be as fast as possible. The connection string will differ on each connection (Based on Instance and Database being connected to) how would I manage this? A string in the config file for the applications database would make sense, as that would be static but the databases being worked on will vary with each connection. Currently I'm creating a connection for each instance within the main form:

Dim 2000Connection = New SqlConnection("Data Source=" & SQLServerName & _
"SQL2000;Initial Catalog=Master;User ID=sa;Password=P@ssw0rd;Pooling=True;")
Dim 2005Connection = New SqlConnection("Data Source=" & SQLServerName & _
"SQL2005;Initial Catalog=Master;User ID=sa;Password=P@ssw0rd;Pooling=True;")
Dim 2008Connection = New SqlConnection("Data Source=" & SQLServerName & _
"SQL2008;Initial Catalog=Master;User ID=sa;Password=P@ssw0rd;Pooling=True;")
[Code] .....

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Multiple Instances Of A Form?

Sep 13, 2010

If I create a console application for example with a class named "Person" I can create an object variable with a ceratin name only once. For example:

Module
Module1
Sub

[Code]....

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Multiple Instances Of Class?

Mar 29, 2010

I have the following problem. (VB.Net 2008)I have created a class (myFirstClass). In this class there are a lot of calculations being made wich gets fired by events in that same class.Now i want that same class to be able to fire more instances of itself. However i noticed that each time i fire an event from a Sub the program waits till the event is finished before going to the next line of code. This is a problem since i want the event wich fires a new instance of the class to fire it and forget about it.

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Multiple Instances Of The Same Form?

Mar 3, 2010

I have two forms in my application. Form 1 is a listview that is populated with unique Customer IDs. When the user double click the listview on the particular Customer ID then it loads Form2. Form2 has many listviews within it such as a listview for the Customer telephone, another listview for their addresses etc and all the data presented in Form2 listviews are based on the Customer ID that the user clicked in Form1.

So here is my question...I want the user to be able to open Form2 with that particular details of the customer but also to go back to Form1 and double click another Customer ID and opens Form2 again (such as replicating Form2) with the other Customer details.So the moral of the story is i want the user to be able to have many instances of Form2 open each time they wish to view a different Customer ID without having to close Form2 down every time.

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VS 2008 X86, X64, PID, Multiple Instances?

Feb 6, 2010

My ultimate goal is to get a list of PIDs and have a user select 1 of them.For example: the process image name is program.exe. The application name varies for each instance the program.exe is run, and therefor each application name has its own PID associated with it. By application name I mean the Task name under the Applications tab of Windows Task Manager. Another issue I face is that some systems run x64, so the name is no longer program.exe but program.exe*32

So my issue is, how do I search for program.exe, or on x64 platforms program.exe*32, and if there are multiple instances of program.exe/program.exe*32 running, how can I get a list of PIDs for each and associated them with the application name as the Task name under the Applications tab of Windows Task Manager.that might sound a bit confusing! So if it is, please let me know and I will try to explain more. Any reference guides or example code would be greatly appriciated as I have only used the "System.Diagnostics" but once.

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Transaction Error On Call To Commit() When Select Has Been Executed Inside Transaction?

May 9, 2011

I get this error at the Commit of a transaction in a desktop application:

This OleDbTransaction has completed; it is no longer usable.

Other posts I have seen with similar error suggests this can occur if it takes a long time, or contains large amounts of data. This is not the case here.Logging tells me it takes 140 ms from Begin to Commit and about 10 commands executed inside the transaction.It is using an Oracle database.This class is a simplified version of my database class:

Class MyDatabase
Private mConnection AS OleDbConnection
Private mTransaction AS OleDbTransaction

[code]....

Is it not allowed to run a select inside a transaction like this? Or can it be done by running the transaction in a specific isolation level (I see that the BeginTransaction method has an optional parameter for doing this) ? ..Or some other sollution..? In my case, it was not a problem to move the select to run before the transaction started, but what if you need to run selects that must run inside the transaction?

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VS 2008 - Transaction SProc's In Code - Says That My Insertcommand's Transaction Object Is Null

Apr 29, 2009

I've seen plenty of examples of transactions in the actual store procedure's SQL. But I'm wanting to do the transaction and keep track of it in code. I tried this but it says that my insertcommand's transaction object is null. How can I fix this?

vb Dim conn As SqlConnection = DBConnections.SQLServerConnection
conn.Open()
Dim params(1) As SqlParameter

[CODE]....

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Adding Multiple Instances Of Same Control

Jan 14, 2011

I have a control which consists of a couple of labels and a couple of buttons side by side.I want to add multiple instances of this control to a panel.The problem I have is with positioning/formatting.Whenever I add the control it just gets added on top of the previous one.Should I be using something other then a panel? Are there any tips ot tricks I should be aware of ?

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Checking For Multiple Instances Of Application?

Aug 30, 2010

How can I check for multiple instances of my visual basic application? When the user runs the application, I want to know how many instances are already open.

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Communicating Between Multiple Instances Of Application?

Mar 9, 2009

I have an application which the user can open multiple instances on the same machine. However, a section of the app would have sync problems if more than 1 instance has control over it. This is where I thought of transferring control, or sharing, between them. What should I be looking into?

They would have to be able to identify which one of them has control and to send text information over. I thought IPC or Named Pipes could do the trick, but I'm unfamiliar with them and examples seem to indicate only a single server will work. Here, I have multiple instances of the same app and every one of them needs to be able to listen for that request for control.

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Creating Multiple Instances Of A Form?

Aug 12, 2009

I have a form (form1) and I havea button on form1 (button1) that will start a second form (form2).How can I make it create multiple instances of form2 when button1 is clicked?i tried a process module that the studio comes as standard but it does not allow me to start multiple instances...how can i do this?

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Hold Multiple Instances(10) Of Alarms?

Jul 20, 2010

I have created an alarm program but am having an issue creating multiple alarms. Here is what I have so far. I have created an array to hold multiple instances(10) of alarms that I want to run concurrently.

Code:
Dim SetAlarms(7, 9) As String
Public Shared x As Integer = AlarmNumb
'X=alarmnumb

[Code]....

What I cannot figure out is how to get the program to read the array and recognize each row as a separate alarm to process. This means it must read the array, know which variables to populate with what information and cycle thru the list.

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Loading Multiple Instances Of One .dll In .Net 2010?

Sep 22, 2010

I'm working on a program that uses a COM Object exposed by a .dll. The .dll has a known bug, though, where it acts very erratically when more than one instance of the object is created under one .dll, resulting in crashes or corrupted data a large part of the time. I'm curious if there is some way I can load another instance of the .dll itself, then create another instance of the object without having to need a new process for every instance.

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Multiple Instances Of A Custom Class?

Feb 15, 2009

I have a sub that runs on a button click which I want to create a new instance of a custom class and add it to a list of already created instances of this class. I want the result to be a List Of collection of all of my class instances.

My problem is that each time I run the sub, it simply 'overwrites' the first instance of the class and adds a copy of it to the list instead of writing a new instance. My code is along these lines

dim objFixture as new clsFixture
For n As Integer = 1 To intNoOfChannels
objFixture.SetChannelAddress(n, intCurrentChannelTotal + 1)
intCurrentChannelTotal += 1
next
lstFixtures.Add(objFixture)

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Multiple Instances Of DCOM Singleton

May 19, 2011

Testing a configuration of a Windows 7 workstation acting as a "server" and a Windows XP workstation acting as a "client" (also fails in the same way using a Windows 7 client workstation).

[Code]...

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Multiple Instances Of Forms, Same Record?

Jun 22, 2009

Good Day. Kinda banging my head against the wall on this one. I have a Mdi application with the start form(mdiparent) and form1(mdichild). On the start form, there is a textbox and a button. Heres how I want it to work:

1. value is entered into textbox and button is clicked

2. if form1 is open with that value, Bring it to the front if not, create a new instance of form1

If Not IsNothing(frmForm) Then 'If it is something
If Not frmForm.IsDisposed Then 'it's not disposed
'loop through the open form1s and compare the form1s property to the startform textbox
'if its the same, bring the form1 to the front

[code]....

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