VS 2010 - Showing Forms On Multithreaded Application
Apr 17, 2011
I've finally gotten multi-threading working on my application, but now I'm having trouble showing forms when I need to. I currently have three threads in my program: one for updating a textbox, one for transferring files, and one for displaying forms. Here's a snippet of code from my program:
[code]...
I'm getting the error: Control 'frmXCopy' accessed from a thread other than the thread it was created on. I know what this means, but I can't find a way to make the ShowForm Sub run off of the main application thread.
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Jun 30, 2011
Well I accidently double clicked both of my forms in a project and then they weren't pinned anymore so I exited them out hoping they'd be pinned aghain, but now when I open the project, no forms show up. Just blank blue wall... How can I get the forms back?
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Feb 16, 2012
I am using a MDI parent to house each of the forms in my application. I have a main form and 2 sub forms. The sub forms are opened using the code below. Also, when I am finished entering info into these forms, i am hiding them so that I can reopen them with the same info still entered.
The problem is that when i show the form again, it is blank. Why would this be the case? I am never closing or disposing the form, so shouldn't it just unhide easily?Showing the sub-form(savingsfrm1) and and hiding the main form(riskfrm1)Public savingsfrm1 As Savings
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
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Mar 16, 2012
I don't want it to be MultiThreaded. i read some tutorials and have a good idea. but unfortuantely all the tutorials on the web write code without explaining. so is anyone here has a good knowledge with Chat application ? I know it's about sockets and stuff but i just need an explaination with code ;)
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Aug 20, 2009
I am using Visual Basic 2008 Express Edition and I want to create a multithreaded application.
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Oct 14, 2010
After trying to make an application multithreaded, almost towards the end of the processing of 10,000 records, I get a webexception - operation timeout.Now it seems to process around 8000 records just fine, for each record it is also doing some business logic and with it, performing a call to a webservice.
without threading, its fine - no problems. with threading, we hit the issue.so there are 10,000 records to go through. this is of course slow when done in sync mode (Single threading) but much faster when placing items in the threadpool and waiting until completion.
im not sure exactly why the problem happens. how should I debug this when multithreading? its just odd that for around 3/4 of records, the calls are doing very well, then on the last bit to go, it bombs out.
again - no issues when single threading.update: seems to be after around 1000 records that have been processed that it seems to happen.the application calls out to an internal webservice which then does the direct callout to the "outside world" webservice. The internal webservice does some caching but shouldnt have any effect really.
The outside service it is calling is httpBinding. ReceiveTimeout is set to 00:10:00 (10 minutes) and bypassProxyOnLocal="false"im still not quite understanding why it would timeout after 1000 records because it seems to process the others just fine and does come back (or so it seems) when its making a call to the service
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Mar 20, 2009
I started throwing exceptions on a multithreaded application, and got a mess.There is a good tutorial on managing exceptions in multithreaded applications?
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Nov 16, 2009
I have developed a multithread Windows Application that requires to print various Docss/rpt's off. The problem is I get a "Load Report Failed" error message when creating a new instance of my embedded crystal report.
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Mar 15, 2012
When it is run, screesavers and screenoff is prevented somehow.. I have narrowed it down to this code.
[code...]
The above code is what makes it possible for my application to active two forms when only one is activated.. But it is somehow this code that prevents my screensavers and power settings from working.. Do you have any idea how to change the code so it doesnt prevent my screensavers and power settings?
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Jul 4, 2011
I have a situation with an application of mine where I noticed I get a different result when the application is installed in comparison to it running in Visual Studio. If the application is installed a certain aberration pops up in this computer graphics application at a certain point in one of the screens but if I run the same group of settings or you could say the same "screen" running the application from Visual Studio I don't see the aberration ever happen. I tried deleting the bin and obj folders and then rebuilding before creating an installation and it doesn't change anything and whether I use InstallShield or create an installation using ClickOnce I still see the same issue. I have Enable application framework unchecked but found it makes no difference checked or unchecked
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May 7, 2010
Showing and Hiding Forms from a Console Application causes "Cross-thread operation not valid."
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Sep 11, 2011
I'm trying to make a program of mine into a multithreaded application, but I've hit a pair of snags that I documented in the following code. I can expand this stub into a more efficient version of my existing application.
[Code]...
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May 1, 2012
I'd want to get names of all controls of of all forms of my application. How can I do it?
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Oct 12, 2010
I have a windows forms app (32 bit) written in VB2010 which occassionally hangs in windows when minimised to the task bar You click on the icon on the taskbar and it will not come back up on the screen
No other modal forms are open in the application when the hang occurs Other programs respond OK
I ran Process Explorer against when it was Hung but do not know how to interpret the stack page, or even if it is helpful STack page with my application selected and Threads tab selected with CSwitch Delta column sorted descending. Then double clicking the top entry (my application .exe)
Note: This is running on an x64 machine, but also hangs on x32 machines
[Code]...
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Nov 16, 2010
I am deploying a VB.net 2010 winforms application, and when I install it on the client's machine, the install process also installs an instance of SQL Server 2005 Express. The application connects to a central SQL database on the server. To install, I am using the "Publish" option in VS 2010. Why does it do that? There should be no need for a local instance of SQL Express. Is there a way to avoid installing SQL 2005 Express (I know it is free, but I would rather not have it installed if possible).
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Apr 30, 2012
I have an application that I created a while ago. It's a forms based application that runs on one of our servers at work. The app works well, BUT at the moment, requires someone to manually run it, which means having the admin account always logged in, but having the server locked.Although it's a forms based application, for the majority of the time I don't need to see the forms, so can I safely make this run as a service (by adding the appropriate code), and hiding the forms?Also, is there some code I can put in to test whether the instance of the program was started as a service or from a user double clicking on the icon? If so, I'd like the user initiated instance to run with the forms visible.
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Jan 16, 2012
I am not able to find the Exclude Command in VB 2010 Express. I have no idea which version of Visual Studio it is working with. I've got one 217MB VB 2010 Express file and many 2008 VB Express files with one of them measuring 31 MB. There many other SQL files and .Net Files.
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Jan 2, 2010
I have built an application where there is a MDI parent form and other forms which i have not declared as Child forms but have set these forms not to show in Taskbar. While the application is running, if i have any of these forms open and i switch over to any other application other than this and when i come back to it, all these forms hide. I cannot reopen it or see it anymore.. Why is this happening?? how can i sustain these forms as it is even when i leave the application.LuxCoder
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Feb 23, 2012
I have added a MDI parent to my application and assigned all new forms to it (i.e. Form1.MDIparent = myMDI). When i hide and then show a form, it loses all of the data previously typed in the textboxes.
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Aug 18, 2010
I have the following code in my project:
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connectionString As String
[Code]....
I'm needing to do is to show in my messagebox.show the date from the sql query that I ran before this. I know that I havent declared a variable in that statement but I'm having a bit of a lapse today and was just wondering how to show that result in my messagebox.show.
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May 4, 2010
When my login screen loads, if the user has not created an account the form will close and a form to create an account will appear. However when I code this both forms stay visible, instead of just the one. Where am I going wrong?[code...]
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Mar 11, 2009
I've just upgraded from Visual Basic 6 to Visual Basic 2008 Express Edition.
1. Show anothor form (ie. Form2)
2. Close Form1.
At present when I use the me.form1 , but both Form1 and Form2 both closes.I would like to press a button or on a timer, to show Form2, while closing Form1.
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Jun 20, 2009
my scenario is this: I have two forms and a module. Let's call one of the forms MainForm and the other SecondForm. My module is running on a seperate thread to MainForm. A sub routine is triggered in the module, and I want it to display SecondForm.
I understand that I cannot do this directly because SecondForm needs to be called from the UI thread, which is shared by MainForm. How would I go about doing this? I'm guessing that I would have to use a combination of invocation and calls to MainForm to activate SecondForm.
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Oct 23, 2010
I am a novice in programming and wrote several simple Windows Forms applications. I need to play mp3 file in Windows 7 x64 application.
Could you, please, explain in simple words, how to call MediaElement.Play() method from Windows Forms?
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Oct 1, 2010
I am just learning vb.net using vs 2008. I have a small forms app which I have conected to a small, single table 2 column database. I enter some numbers into a text box, press a button and the data gets entered into the dbase. However the only data that gets displayed in the data table I have on my form is the existing data.No new data entered is shown until I close down and restart the app. I have tried many times using statements such as [code]...
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Jul 26, 2011
What is the difference between the following two statements (in terms of memory management):
Dim frm as New MyForm()
frm.Show()
VS
MyForm.Show()
I am originally a C# developer, how does the second one make sense or even compile for that matter in VB.NET? (Show() is not a Shared/Static method) What is happening in the second case?
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May 6, 2009
I've been trying to get my head round a problem for days now, I want to read 'File.ini' line by line checking if specific text exists in the file and then display on a windows form weather particular settings are turned on or off.
So far this code works if "TargetText" exists but if it doenst I get an error on the code line: "If line.Contains("TargetText") Then".
[Code]...
It works if "TargetText" existin in a line in the file but if it doesnt exist I get the 'Null Reference Exception. Object reference not set to an instance of an object.' Any suggestions greatfully recieved!
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Sep 28, 2010
I have the following
[Code]...
and as you can see, I am showing users the next available date open to them is determined with the value dteReturnValue.ToShortDateString .. but what I'd like to do is show the user both the start date and the end date, which will always be +7 days from the field in my database.
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Jun 4, 2011
When I create an inherited form, after creation for some reason I cant see the form to edit in designer, I mean I cant drag and drop buttons, labels or any control to it since I just CANT see it, I have included a pic of what I see below where Form1 is the Inherited Form. What Am I doing wrong or what is happening
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Oct 2, 2010
I'm trying to show a Windows Form from a DLL file - it's added to the application's refrences But I can't call the Windows Form from the DLL, I tried to make a function that shows the form but when I try to call that function in my application it says: Reference to a non-shared member requires an object reference How can I show the form? I'm tried to use this method: (it's in the DLL's form)
Public Sub Open()
Dim Instance As Windows.Forms.Control = Me
Instance.Show()
End Sub
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