VS 2010 Exception When Two Applications Accessing Same Txt File?
Jul 5, 2011
Im am trying to get two separate applications to communicate with one another via a txt file. The first application writes to a txt file every even second and the second application reads the text file every odd second. The problem is Im getting an exception saying The process cannot access the file FILE_PATH.txt' because it is being used by another process. Not sure if my code is correct or not? Or if there is a better way to do this?
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Aug 15, 2011
how to connect different vb applications to a database server.like accessing data from one database by different applications...
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Jun 21, 2010
how to access an item like a button in a windows application?For example, I would like to create an application that would be able to look at notepad's file menu and "know" that file, edit, etc on the file menu are clickable objects and identify (expose) these objects to my application.
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Jul 15, 2011
I have written a program in VB 2010 that dumps documentation info into an Excel file. Basically, the Excel file is a log file that keeps track of revisions for design drawings at an engineering firm.
There are approximately 20 people that have access to this program. However, I've run into issues where multiple users may be using the program and trying to send info to the Excel file at the same time. The Excel file is set to read only. My program opens the file with write access, and dumps the info into the appropriate cells, then closes the file. If one person is in the process of using the program, it causes an error with another persons system if they try to use it at the same time.
In some cases, it causes my program to crash, and it leaves the Excel file open on someones system.
Typically, my program would only have the Excel file open for a couple seconds. So, the issues mentioned above are rare, but they do happen.
I'm looking for ideas to prevent this issue from occuring.
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Jul 13, 2010
I have an app with 24 different Forms. They have some security options based on which the 5 different buttons Submit, Approve, 2nd Approve, 3rd Approve, Reject etc get enabled disabled.Now I designed a MainForm that has all the buttons and the security code for them. I have created eachform as a usercontrol and load them dynamically based on which form the user wants. My loading works perfectly fine. I load the control and Add it to the place holder in the Page load event of the main page.
Now when the user selects the Submit button I want to call the Save method inside the usercontrol of the Form as each form will have a separate Save. So when I try this code snippet I get the Null reference error. Do let me know how to resolve it.
Private UCDynamic As UserControl
Then on Page Load event I use this code
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If not Me.IsPostBack
UCDynamic = LoadControl("Controls/BkCode.ascx")
Me.PlaceHolderForm.Controls.Add(UCDynamic)
End if
Then on the ButtonClick Event for Submit I do this
Protected Sub Save_OnClick(ByVal sender As Object, ByVal e As EventArgs)
Save()
End Sub
[code]....
Thats where I get the cast Null reference error. So is it that after post back the control no longer exist on the page.
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Jan 10, 2011
im making a program and it needs to load 95 files on form load.im trying to make it to if the file cant be found that it will give a error instead of a JIT debug thing. i triedadding
HTML
Catch ex As Exception
MsgBox("Error: " & ex.Message)
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Feb 1, 2011
This is the code I use to open a file:
Quote:
Public filecode As String
Public Sub getfile(ByVal filename As String)
Dim objReader As StreamReader
But I keep getting the filenotfound exception.
I replaced the file source with the actual location of the file and got the same error. I also checked the permissions of the application to allow sharing and remove read only properties.
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Feb 12, 2012
Currently I am saving data from my applications by saving a text file via a stream reader as a string. I have come to a problem. In my current application, I have an array of the following structure:
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Oct 11, 2011
As we know, one STA UI thread creats the controls only canbe accessed in the UI thread in Winform application. And we need to call control.invoke or begininvoke to run the code in the background thread.
Yes, below code in VB.Net , VS 2010 Winform project can throw the exception "Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on."
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Nov 3, 2011
Here are my questions concerning VB 2010 Express:
1. I've registered my VB 2010 Express, will it still expire?
2. Will the applications I made using VB 2010 Express expire after some time?
3. Is it OK to write my code in the designer.vb file? I don't know why, but when I started writing my application it took me to the designer.vb instead of form1.vb code.
4. I've been working on an application for a week now, but suddenly I can no longer access my Design View(Shift-F7). All my codes are written on the [form name].Designer.vb. I can still view my codes but I cant access my form layout. On the solution explorer, my forms no longer have the 'form icon'. When i press Shift-F7 nothing happens. Right-clicking the form on the solution explorer doesn't show 'View Designer' option. How can I fix this?
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May 30, 2010
1) Ive put the code to execute a file, it works fine but i want a way to show a popup/message if the file does not exist instead of the typical 'Unhandles exception has occured, system cannot find the file specified.' My code is below, i dont mind using a differend code as long as it opens the file Program FilesInfinity SoftwareAeroCrash Apps11.acep
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Sep 12, 2011
I am working on a project that is used for key broadcasting. Don't worry nothing illegal, I'm making a multibox application for world of warcraft. However I am having trouble when it comes to launching and manipulating other applications from another.
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May 8, 2009
It is possible to catch an exception and throw a new exception which wraps the first exception as an inner exception: [URL] Also, if I call a function and it throws a certain error, but I catch it, will the calling code's catch handler execute? If so, and it is of a higher exception type, is this not wrapping the exception? eg I can throw exception ex of type IndexOutOfRange, log it but rethrow, catch a higher up exception and do something, or I can throw a new exception and wrap an inner exception like:
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Mar 21, 2012
I have one small problem on my app, here's the deal, when I run my app that have a button for "load playlist" and when I click on file>options my app is looking for settings.xml (created before by the same app) on the same folder from where I loaded my playlist. Load playlist button is on my Form1 and Form4, and settings is on my Form6, and this happend every time I load anything, open anything, so my app remembers last opened folder. Is there any way that I can return my path to apps path? I need to mention that this applies only to Windows XP, idk why, because on my win7 it works just fine.
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Feb 19, 2011
I'm trying to learn this and had gone through some tutorials (found on googling).But most of them are a bit harder to understand. An easy to understand version was not found Do you know any links to a good tutorial ?
Also, where can I get a good example program written using 3-tier architecture in VB ?
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Oct 19, 2010
just wanted to ask if it is possible to have different applications sharing the same session (i.e. database session)... i'm planning on creating a web-based application and a form-based application using asp.net for web and vb.net for forms but i need to have them share sessions since some global variables will be session based and also authentication to one application should also authenticate on the other.
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Feb 26, 2011
So I'm creating an application that will notify a person of something when I send a command. I've been thinking of just using a TCP connection to do it but there must be an easier way.
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Nov 2, 2009
I am using VS 2010 to create a Mac OSX like dock application.Everything has worked great apart from one of the key features of the dock! So what I want is:When the user clicks the minimize but on any (including external application) it minimize to the dock I have created rather than the windows Task-bar.
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Dec 4, 2011
I have made a dock bar program
So when I drag programs in I get this
But when I restart my program all the dragged in applications are gone.
save my settings,
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May 12, 2012
I am wondering if it is possible to run an application from a domain account that has restrictions on running .exe files by coding in the local administrator details (username / password).
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Oct 28, 2011
I could not find a clear cut answer to this question when searching MSDN (too many references come up about Microsoft Document Imaging) so thought it better to ask.
Is it possible in VS2010 to create a new MDI application and import stand alone Windows forms applications into it?
The reason I ask, is we have a number of tools that have been created as single apps but there are quite a number of them and it would be nice to combine the lot into an MDI app.
However I don't really want to re-write any of the apps, so is there a way to import them instead?
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Feb 3, 2012
I need some assistance in creating a program that logs all the processes that the Application does. I want the program to log every process, the Username, any error messages,the date the process occured to a textfile. I attached is the code that I have put together. Have issues getting the processes to be Logged.
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Dec 19, 2011
I want to be able to use a loop and reference controls using a string. The following code works for textboxes.
dim myControl as Control
dim ControlName as string
dim LoopCount as Integer
For LoopCount = 1 to 3
[code].....
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Jun 12, 2012
I have a datagridview on a form and this shows up my list of suppliers. I have a textbox which when i click shows up the supplier list and from there when i double click on a row, the supplier's name is shown in the textbox. The thing is i have to do same on the same page for search purposes which got its own textbox. But the cell double-click event already contains code that will display it in some other textbox like i mentioned previously. What i thought is to make another form with a datagridview. So this datagridview will be used to display the supplier's name in search textbox. But what if i have to access this form several times. Do i have to create several forms everytime?
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Feb 17, 2011
I am using VS 2010 and Access 2010 and in a table I have a Primary Key called Counter which is an Autonumber.When I save a record I need to be able to access the value of the counter field for the new record. When I try and access the field I get a value of zero.I can see the value in Access but I cannot set it in Vb.Net. I have set the fields and then
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Feb 28, 2012
I've a problem with accessing to values of added TextBoxes. I'm adding TextBoxes in my application using NumericUpDown control (event of NumericUpDown1_ValueChanged). It' s value is 1 to 10 and by each step it adds 2 new TextBoxes (named TBC11i and TBC12i, i=1-10). I've created a second event (ButtonClick) where I want to use their values in a For Loop named like this:
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Jan 18, 2011
Im quite new to VB.Net so, this is what i have. A simple "console" form. Its just a form with a ListBox in it. To add stuff to the ListBox, i have to open the console, to let other forms know what the ListBox there is.
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Feb 26, 2011
I have a script where I make separate routines with identical code
Example:
sub AddToA {
ATotal += 1
}
sub AddToB {
BTotal += 1
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Jun 1, 2011
My problem is that I have a program which needs to access images for multiple choice questions, hundreds of them. Now when I publish the program it is not taking the images with it. I have read some information by 'kleinma' regarding publishing and he says to right click on the Bin and click include in project, but when I do this there is no command in the menu for this.
I have included all of my image files in the Bin and have also added them using the resource editor, but to no avail As I have indicated it is the Express edition, could this make a difference
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Jul 22, 2010
I migrated some applications from Visual Studio 2005 to Visual Studio 2010. I develope using VB.NET in VISUAL STUDIO 2010 on a Windows 7 PC (32 bit). The applications writed in VB.NET - VS2005 run correctly in PC having XP, VISTA, WINDOWS 7 and Windows Server 2008. After the migration, the exe of these applications work correctly in PC having XP, Vista, Windows 7 but work stop immediatly on Windows Server 2008. The error returned is 'System.InvalidOperationException'. Seems that the application stop when attempt to evaluate the first global variable that meets. If i change the framework from 2.0 to 3.5, things don't change.
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