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 for example, it is OK and won't load multiple instances.But when I create a new version, for example, then I can run 2 instances of my application, when the 1st instance is and the second instance is should I do to prevent this?

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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.


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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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"Make Single Instance Application" Supposed To Work Across Multiple XP Users?

Jun 30, 2009

I am writing a program in (vs 2008) that requires that only one instance of the executable be running at a time. Naturally I went for the simple solution by selecting the "Make single instance application" checkbox in the Project properties. Unfortunately, this option does not seem to work across multiple users that are logged into a single XP machine, thereby causing the same issues for my program as if I were able to run multiple instances on one single user. Granted this is a corner case, that someone would switch users while my program is running, but I'd like to understand the limitations. So my question is whether the "Make single instance application" property is supposed to work across multiple users? or is it limited to only one-instance-per-user.

Here are the steps the recreate the issue (prereqs: computer with XP pro installed, 2 user accounts (not on a Windows Domain), and a dummy "single instance" program created using the property mentioned above):

1) Log in with user1, start up the single instance program
2) Switch to user2 (StartMenu -> LogOff -> Switch User)
3) Start up the single instance program using user2

*After step 3, the program launches without complaint even though another instance is running on user1. Is this a glitch? or by design?

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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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Transfer Control To The New Instance In A Single Instance Application?

Jul 15, 2011

I have a single instance VB 2010 application I know how to communicate with the next instances run through the StartupNextInstance application event. The usual way of working with this is parsing command line arguments of the new instance and continue execution of the old instance. What I would like to do is replace the running instance with the new one. Is there any way to do this other than disabling the single instance property ?

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.net - Store Application And User Settings Of An Application Running With Multiple Instances?

Jul 12, 2011

Which is the best way to store application and user settings of an application running with multiple instances?My problem is that using the vb's "Application Settings" one instance would overwrite the other one.I want to identify each instance with a number passed via command line argument. I could use this number to identify the appropriate settings of the running instance, but I see in a local INI o XML file a better way to handle that.

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Creating Single Instance Form In MDI Application - Check Whether Form's Instance Created Or Not?

Feb 8, 2012

creating single instance form in MDI Application. How to check whether form's instance created or not?

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Single Instance Application Is Checking For A Totally Different Application Being Run?

Aug 26, 2009

I'm writing code with MS Visual Studio 2005.When running my application I get "foo.exe is already running on this machine".(Even though I'm running faa.exe instead

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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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WPF + Communicate Between Multiple Application Instances?

Mar 20, 2010

I need to grab information between two instances of my WPF app (the contents of a public collection, to be precise).

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Make Single Instance Application, What Does This Do

Aug 25, 2009

in vb 2008 express this option is available under application properties. does anyone know what is its function? does it make it so that it's impossible to open two instances at the same time?

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Restarting A Single Instance Application?

Apr 13, 2009

Is there any way of restarting a single instance application, which is deployed via clickonce?

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VS 2010 - Single Instance Of Application

Jul 12, 2010

i am using "Animated Window Effects with "Toast" popup demo" code from the code bank created for jmcilhinney. I put a NotifyIcon control on it and check Make single instance application on the project properties windows. the problem is that every time that i launch the app it creates one instance on the system tray of the app. i can not figure out how to over come this attached is a copy of my project.

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Check If Multiple Instances Of An Application Are Running?

Aug 15, 2011

I made a simple "restarter" app... However, I need to close multiple instances of an application. For example, if I have three windows of paint, or three windows of Word open, how do I check if it is still open before I open a new instance?


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Keep Single Instance Application Maximized After Restore?

Feb 17, 2012

I have a VB .NET application set as single instance. When I try to launch the application the second time its window is restored to its normal windowed state instead of being maximized (like it was before attempting the second launch). How can I make the application window to preserve its last state?

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Single Picture Box To Load Multiple Images?

Mar 22, 2011

load images into a picture box. Firstly, is it possible to use a set of randomly generated numbers to display a random picture from a selection into one picture box?

i.e. Dim RandNumber As Integer
Dim RandClass As New Random
RandNumber =, 10)


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Custom Single-Instance Application - Read-only Cache

Mar 14, 2011

I'm trying to build a single-instance application, but not in the traditional sence. Instead of a simple silent prevention of launching a second application, I want it to send a message to said application so it launches a second mainform in my original process.

(I want some read-only cache (language, style,...) shared, and a few sources like local settings shared, but other then that all resources reside in the mainforms and act as seperate applications.)

(I'm not looking for specific code, more for hints/tips and/or general directions, more specificaly on what parameters do you check process equality, and what method do you use to pass the message? Windows Messages? Sockets? ...)

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WPF Single Instance - Cannot Override The Main Sub In Application.xaml

Mar 29, 2011

Has anyone using VB.NET 2010 been able to create a single instance application? I've followed the MSDN sample but it does not have an Application.xaml file. Converting any C# samples to VB doesn't work as I cannot override the Main sub in Application.xaml (C# calls it App.xaml).

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Save Multiple Textboxes To A Single File And Load Each One By Itself?

May 28, 2010

I have a sign up sheet that I am working on for instance;

street address

I've been trying to save the textboxes individually but when I go to load the information everthing is pushed all into one textbox.....I'm also using the SaveFileDialog and OpenFil

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Turn On The Single Instance Application Choice In Visual Studio 2008 Properties?

Dec 22, 2010

I wish to turn on the Single Instance Application choice in Visual Studio 2008 properties. To do so, I must choose "Enable Application Framework". When I do that, my ONLY choice is to choose a Startup Form, not a Startup object. This makes no sense to me. I have a tray application, and I check to see which form I should load, a logon form, or the main form. But since I am forced to choose a startup form, I MUST load the logon or main form to begin with. But I don't want to. I want startup code to determine which one to load first. So then I am playing with making the OTHER form invisible, even if the startup form, but that is a mess.

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Load A Single Email To Vb Application?

Nov 19, 2011

I have outlook 2003, Now in my application til now i tried loading bulk of emails from folder to my application.But now i need to select a single email and load to application.How to achieve this?

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Make A Single Instance App And Showing The MainWindow When Another Instance Is Launched In .NET With WPF?

Aug 30, 2011

I am looking for a way to make my app running in a single instance mode and showing the MainWindow of the first instance when another instance is launched.I do a quick search on the internet but I did'nt find anything to open the MainWindow of the first instance or it was for Windows Form not for WPF.

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Avoid Multiple Instance Of An Application?

Oct 19, 2010

I developing a windows application. i dont want to allow multiple instance of the application how i will achive that?

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Sharing Data Between Multiple Projects In Single Application?

Jun 11, 2011

I have a windows forms application with one exe and several dlls(Class libraries) in a single solution. The application uses common data that is used across all the dlls. I would like to load the data when the application is starting up and use the loaded data at various points in the dlls so that I do not have to load the common data again and again. How can I share the data loaded in main EXE across the DLLs?

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Force Multiple Instance Of A Standalone (3rd Party) Application

Jul 14, 2009

I need to be able to run multiple instances of a standalone (3rd party) application. This application prevents multiple instances from being ran from within the application. I need to basically override this.

I know it can be accomplished by hexing the original executable, however I would like to stay away from this method as I'd like for other users to be able to use my application from the get go without needing to hex the 3rd party app themselves or me having to send them the hexed app. Is there any way to achieve this or am I just taking crazy pills?

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Enable The "Make Single Instance Application" In The Project Properties?

Jun 29, 2010

If you mark your application using "Make Single Instance Application" option in the application settings tab and run your application under a GUEST account or a restricted limited/standard account the application throws UnAuthorizedAccessException or CantStartSingleInstanceException.

Take the following steps to reproduce this behavior.

1) Create Windows Form application.

2) Enable the "Make Single Instance Application" in the project properties.

3) Log onto a GUEST account and open the application twice to simulate StartUpNextInstance.

We need developers to reproduce this behavior and post any valuable input if you experience these symptoms.

When posting information please include the following:

a) The operating system version + service pack.

b) The .NET framework version used.

c) Verify this symptom is present when running under GUEST account.

To workaround this issue turn off the "Make Single Instance Application" option ad create a Local named mutex in the StartUp() event.


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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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