I am using vb.net, and in my program I get this 'crossthread operation not valid' error when I run my backgroundworker that will make this textbox enabled true. My main sub will first turn the enabled to false, and when the backgroundworker runs it will turn it back true then exit. Why does it give me an error? FYI: There is more code to this but I don't want to make it any more confusing... Here is the stack trace:
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I am trying my best to figure out how to go about this error i am reciving:Cross-thread operation not valid: Control 'ListView1' accessed from a thread other than the thread it was created on.
I have a backgroundworker thats extracting cells from an excel worksheet and placing them into the listview.
Upon form load i do this:Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Call createListView()
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Cross-thread operation not valid: Control 'ListView1' accessed from a thread other than the thread it was created on.I have a backgroundworker thats extracting cells from an excel worksheet and placing them into the listview.Upon form load i do this:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Call createListView()
End Sub
[code]....
The error is on this line:
ListView1.Items.Add(lvi)
I know I'm not the only developer experiencing this issue but only within the last month I started receiving Visual Studio 2010 hangs while running running a simple ASPX web project within the IDE. On stopping the execution or closing the web page VS2010 hangs and becomes completely unusable - stating that VS is busy. It never returns and I have to stop the DEVENV process, resulting in a complete shutdown of VS.
Until now (1 1/2 years) I've been developing a Winforms application with no issues, other than VS2010 IDE errors that have been documented and I've been able to work around. Now, like my Web project, I am also experiencing the same hang but not as frequently. Other documented cases is this forum don't apply in this case since I'm not working with an IIS web site.
Additionally, in reading the forum messages I notice this issue has been around for years and has caused a great deal of grief and delay to many development projects. I'm running Win7 Pro, VS2010 pro on a Pentium Dual-Core CPU 2.20 Ghz with 4 GB memory laptop running in 32 bit mode. I'm very concerned at this stage of the process to upgrade to VS2010 SP1 since I've read too many horror stories online and can't take the risk of affecting the only support environment i have for Winforms application that is currently in production
Got a proccess thread thats in charge of loading a listbox full of the first line of text for richtextbox items on form load. Though I use Me.Invoke(New MethodInvoker...) to add items on the main thread so its thread safe it coughs when the first line of rtf data are thrown at it, acting as if I hadnt called adding the items on the main thread.
Up at the class level:
Dim Worker As System.Threading.Thread
In the load procedure for the form:
Worker = New System.Threading.Thread(AddressOf WorkerDo)
Worker.Start()
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I"ve also tried to remedy this using a delegate to invoke the listbox before attempting to update it, but the invoke method itself is throwing the exception. I am not using the default instance of the form (a new instance of this form is created). Anyone know how I can get around this? I can't load the listbox full of items directly in the form's load procedure because work takes place in the thread beforehand so there are strings to add to the listbox. I've got MS Visual Studio 2008 Pro and Vista SP2 (latest updates applied).
i create a thread that load a function, in this function i need to read from txtbox into the same form and during the function write into another textbox the call to function is done in this way Dim t As Thread t = New Thread(AddressOf Me.myFunction) t.Start() from myFunction i read info in this way myInfo = textbox1.text and i write into textbox during the execution of myFunction in this way textInfo.text = myInfo but in debug time i have an error of crossthread.. how can i solve this problem??
View 4 RepliesI want to ask a queation about this following error;Error Visual Basic compiler is unable to recover from the following error: Not enough storage is available to complete this operation.
View 13 Repliesi am creating here coding which use to substract number in database from textbox. In my coding i use textbox which receive number from user and it will subtract a number in database. For your info i am using UPDATE sql command for this operation . In the same time i also create table name InItem and have column name Itemquantity After i click the button i got an error InvalidOperationException was unhandled from my coding Here is my coding and correct my coding if it have missing part. I also highlight which code give this error. Oh ya , is that my sql command for subtraction is correct? i also not sure cause it get it from internet.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim ra As Integer
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I am getting some cross thread operations not valid when I am trying to run my code. I am handling a button click event to execute a method that runs a process to do a file converison, when the process is finished I run another method that converts the file to zip format, when that is done I run a method to upload the file to a ftp server, and when that is done I run one final method to update my database and the dataset; however, it is liking the way I am running these and I am getting cross thread errors and an overflow error when calling the fillBy method of my table adapter.
Here is the basic outline of what I have:
Private WithEvents conversionProc As New System.Diagnostics.Process
Inside the click event I call the method:
conversionProc.Start()
Then I handle the exit event of the Process as:
Private Sub conversionProc_Exited(ByVal sender As Object, ByVal e As System.EventArgs) Handles conversionProc.Exited
' Once the Process to convert has finished it will exit - Flag that we created the KML file
kmlCreated = True
[Code] .....
Will i be able to successfully install 2010 beta 2 side by side 2008? because i want to test 2010 features and some development toolkits such as silverlight while i don't want to uninstall my visual studio 2008 professional.
View 2 RepliesI'm getting a Cross-thread operation not valid error when my label text changes - this is very strange because it was working up until yesterday.The only way I can get this to work is by applying the invoke..[code]Is there a more simpler solution or will I have to invoke all my label coding?
View 9 RepliesDuring Loading of form I call connectpaybox to show the list in the combobox, but after that it will result in the error "Operation is not valid due the current state of the object" but the combobox items that was taken from the database shows. I tried "select CAGECOST from CAGETYPE where CAGENAME like 'Normal'" where Normal is one of the items in cagename and it works.
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I am using Visual Studio 2008. While opening some of the .resx file, it is giving me error that "The operation cannot be completed. Invalid Pointer". What can be the possible problem and solution?
View 1 RepliesDoes anybody know which version of Visual Studio 2010 contains the full set of Visual Basic SharePoint Templates? I am about to embark on a project to create Visual Web Parts to be used in a SharePoint report.
At the moment I am using Visual Studio 2008 and even though the WSPBuilder is installed none of the relevant SharePoint templates are present.Having searched SO and the web, most advise to install the templates via the Visual Studio command prompt: devenv /installvstemplates
Alas the Visual Studio command prompt is also missing from my VS2008 installation.So, the question remains: which version of VS2010 contains what I need for pain-free SharePoint development? There is a rather large price different between VS2010 Professional and VS2010 Premium, so can anyone tell me if the cheaper version (VS2010 Professional) contains all the Sharepoint templates?
I am just wondering how I can add Direct X references to Visual Basic in Visual Studio 2010 Beta 2. I cant find them in the .NET reference list, or the reference list, or anywhere. I downloaded the Direct X SDK for August 2009, but I can not add the .dll files to the reference list. Is there anything I can do to add them? I need the references for programming reasons.
View 5 RepliesI want to use "OpenGL" in my project. Is it possible to associate it with "Visual Basic" application developed in Visual Studio 2010? If yes then how can we do it.
View 1 RepliesI have a project in visual basic 2010 and want to convert it to visual studio 2010 so I don't have to chose the "open with" every time. Is there a tutorial on how to do this?
View 4 RepliesTo reproduce the error I'm getting:Create a new Visual Studio 2010 ASP.NET web site in Visual Basic, targeting .NET 2.0Type "Public Property Test As String" Observe "Visual Basic 9.0 does not support auto-implemented properties." error Visual Studio 2010 is happy to use VB 10 against .NET 2.0-targeted Windows Forms applications, this only appears to be an issue with ASP.NET.Is there a way to force Visual Studio 2010 to use VB 10 when targeting .NET 2.0?
View 1 Replieshave just overlooked something somewhere...I am writing VB.NET stuff in VS2010 on Windows 7 64-bit. It seems to build by default for a 32-bit target, how to I tell it to make a 64-bit executable?
View 2 RepliesWebMatrix is a web development and deployment tool by Microsoft so how is this compared to Visual Studio? which Use C# Razor Syntax is that more better coding.
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I have to compile projects which was compiled in Visual Studio 6 in Visual Studio 2005. When i compiled i got a set of same error. I opened the project for VS6 by selecting File->open->project/solution and tried to build a solution by Build option but i am getting the following error.
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Is it possible to open visual studio express files with normal visual studio?
View 2 RepliesAt present I have wrote an application (in-house CRM, vb .net 2010) which allows me to send emails under the selected customer & I categorised these emails.As these are categorised I can return data to display email history in my program by using search criteria:
Dim oMail As Outlook.MAPIFolder = oNS.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail)
Dim sSearch As String
sSearch = "[Categories] = '" + "[" + tAccount.Text.Trim + "]" + "(" + tShipTo.Text.Trim + ")'"
Dim oItems As Outlook.Items = oMail.Items.Restrict(sSearch)
However the limitation to the above is it only looks at sent items & no other folder.My ideal solution would be to display all email correspondence for a certain contact.
Well I used the Visual Studio 2010 installer to install my application and I want it to be able to change the version displayed in the in the Add/ Remove Programs (in the Control Panel). How can I do this without going through the install wizard again?
View 3 RepliesI need to write from VS 2010 vb.net dataset into a newly created xlsx file.
View 2 RepliesIn one application, I need use 4 simultaneous threads.When the threads finished, I need to update the text of a TextBox.So, I create 4 Textbox, and I wanna the threads change the text to FINISHED.Each thread change one distinct TB.I use this "example"
Dim Terminados As Integer = 0
Private Sub frmEnviarMensagem_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
Timer1.Start()
[code]....
The problem is, I have an error in the red lines.The error is: INVALIDOPERATIONEXCEPTION "Cross-Thread operation not valid: Control tbPlaca1 Accessed from a thread other than the thread it was created on."I don't use cross threading. Each TB only was accessed for the correspondent thread, and for the "main program".
I'm working on a project started in VB9 (VS 2008) and now I've migrated to VS2010 (VB10) but on the production server the IDE is still VS 2008. On my developement enviroment the code compiles fine, but sometimes, - let's say - I forget an _ at the end of the line which causes the VB9 compiler to throw an error.So the question is, how could I build a project with the VS 2010 IDE but VB9 compiler? Or to force the VB10 compiler into VB9 mode?
View 2 RepliesI have to develop an application using MS Visual Studio 2005 or above with the following objective:
* The application should allow users to create as many new forms as they want and each form should behave like a MS Visual Studio WinForm. By saying that it should be a container for drag and drop of controls from the toolbox that I will develop....
* Once the user design's each screen to his taste by placing various controls on the form, he should be able to save the form as a screen. Of course I have to provide functionality for each of the controls such as if he drags a button on to the form, he should be able to specify what action it has to perfom when clicked when the application is put into run mode. Quite similar to regular windows form button.
* My application should have two modes: a DESIGN MODE, where user can drag, drop controls and specify what they should do when put into RUN MODE. This is quite similar to MS Visual Studio designer.
* Last but not least is to be able to access the application via the browser with the same look and feel his desktop version.
I have to develop an application using MS Visual Studio 2005 or above with the following
objective:* The application should allow users to create as many new forms as they want and each form should behave like a MS Visual Studio WinForm. By saying that it should be a container for drag and drop of controls from the toolbox that I will develop....
* Once the user design's each screen to his taste by placing various controls on the form, he should be able to save the form as a screen. Of course I have to provide functionality for each of the controls such as if he drags a button on to the form, he should be able to specify what action it has to perfom when clicked when the application is put into run mode. Quite similar to regular windows form button.
* My application should have two modes: a DESIGN MODE, where user can drag, drop controls and specify what they should do when put into RUN MODE. This is quite similar to MS Visual Studio designer.
* Last but not least is to be able to access the application via the browser with the same look and feel his desktop version.
Now I'm at the end of the first part of my project and now i need to print a voucher with few pre-printing words and 7 fields that comes from a dataset.I try to use *rdlc file on which i made all the necesary layout very good, and the link was very good as well But print NO I did something in *.xaml file very dificult to put controls and make the links.But lets say i will do it, for the moment i have a picture and a label with few words, and I'm trying to print it with the following lines
Dim myPrintDialog As PrintPreviewDialog = New PrintPreviewDialog
Dim myDocument As New PrintDocument
myPrintDialog.Document = myDocument
myPrintDialog.Document.DocumentName = "OrderVoucher.xaml"
myPrintDialog.ShowDialog()
But in the dialog I see only a blank page.Of course I have a mistake in my mentality of building my code but I don't know where is that.I also need to admit that is the first time in my life which I'm trying to print from Visual Studio 2010.Now Please I need the best assistance you can give me.For the moment i want to print in my default Laser printer.But in the final stage i will have to print in an Olivetti PR2 (Bank printer) which will be connected in the com: port.That will be the day if I succeed :)