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Cross threading errors

Posted By:      Posted Date: September 20, 2010    Points: 0   Category :WPF
Hi.  I am getting a Cross thread error using VS 2008 Visual Basic when I handle information from a Com port to the main form.  Is there a way to ensure the proper threads are being used?

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Cross Threading Problem

Private Delegate Sub CCDelegate(ByVal CClient As ConnectedClient, ByVal text As String)

Private Sub MessageReceived(ByVal sender As ConnectedClient, ByVal Message As String)
        Dim data() As String = Message.Split("|"c), x As Integer
        Select Case data(0)
            Case "/CONNECT"
                If GetClientByName(data(1)) Is Nothing Then
                    sender.Username = data(1)
                End If
            Case "/DISCONNECT"
                If clients.Contains(sender) Then
                    For x = 0 To lbClients.Items.Count - 1
                        If lbClients.Items.Item(x) = data(1) Then
                            If lbClients.InvokeRequired <> False Then
                                Me.Invoke(New CCDelegate(AddressOf MessageReceived), sender, Message)
                            End If
                        End If
                End If
            Case Else
                MeterData(Message & vbCrLf)
        End Select
    End Sub
I can't seem to execute this line:


Hello World to C# Threading Part 1

In this post we will see how we can implement simple threading. Why do we need threading? When you want you application to do more then one thing at same time, then you need to implement threading. One usual and common scenario would be when your application needs to get data from some other resource like web services and you don't want you application GUI to be freeze during this time. In that sort of case you will run the code to access web services in separate thread so your application GUI won't freeze. The System.Threading namespace .NET provide interfaces to implement multi threading.

Threading in C#

What is Threading?
-Parallel execution of code pieces on CPU, commonly compiled codes started in a single thread but it is possible to create multi-threads within a program.


Multi-core processors are new standards on the user's hardware. By taking advantage of the multi-processing capabilities of these machines you can achieve significant performance upgrade with some minor changes in your code. When an application does not make use of threading techniques it is wasting valuable resources. This tutorial will cover the basic threading concepts and threading methods and properties.

Multi-threading in .NET: Introduction and suggestions

This article uses the C# type shorthands throughout - int for Int32 etc. I hope this makes it easier for C# developers to read, and won't impede any other developers too much. It also only talks about the C# ways of declaring variables to be volatile and locking monitors. Developers using other languages can find the equivalents in their own preferred environment, I'm sure.

How can I be sure that my entire project is up-to-date and free of errors in VS2010?


Seems like a stupid question, but I will go to Build > Build Solution many many times and the build will succeed many many times, then I will put in a minor syntax error and the build will fail, BUT the build will not fail because of the minor syntax error; it will fail because of an unresolved type that I put in about twenty compiles ago. And then I will fix the minor syntax eror, and the compiler will still complain about the unresolved type. Here is my code:

<%@ Register TagPrefix="FTB" Namespace="FreeTextBoxControls" Assembly="FreeTextBox" %>
  <form runat="server">
  Hello World!!  

Pretty simple, really. I go to Buld > Build WebApplication1 and it runs OK. Now, if I put in a minor syntax error, such as substitute "forrrrrrrm" for "form" and then try to Build Solution, it complains not about the misspelled word, but about the FreeTextBox. And then if I correct the misspelled wird, it still complains about the FreeTextBox. Which leads me to believe that Building the Solution does not check absolutely 100% everything that needs to be checked. Is there a more thorough way of compiling a program that I need to use?

How do I preserve __viewstate between cross domain posts or how do I get a __viewstate of a Remote S


Here is what I want to do:
I have a local site in which I want to display data from a remote site
Lets say: I want to display data of http://www.abc.com/Default.aspx on my localhost

Now Default.aspx requires some post-data which it sends to itself. Thus the __viewstate and __eventvalidation are posted back to it by itself. I want to directly post the data to Default.aspx from localhost without opening Default.aspx and display the Default.aspx's response on my localhost.

The WebApp on http://www.abc.com is configured for __eventvalidation i.e. I cannot post-data to it from my localhost without getting a __viewstate from it. I also have to post the current __viewstate of http://www.abc.com/Default.aspx to itself

How can I accomplish it?

Multiple Paramatized Threading issue


I need the funcitonality to have two methods run concurrently of each other and the parent thread (aka the method that makes these two calls) to halt until BOTH are done. After the threads are done, I need to perform logic on the returns of the method, so it is essential for both of them to be complete before the parent thread continues. I have searched the internet and tried varous attacks, and I always come up with the same result, this being the parent thread continues operation after the first thread finishes, leaving the second thread running.  Can someone show me a quick example of how I can do this. I have tried checking states of the threads, halting the threads, but I always end up with the same thing. Any help would be great. Thanks.

Word Automation - Multiple DCOM Errors/Behavior

Before I get started, I already know that Microsoft does not support and highly discourages server-based MS Office automation.  I've read a multitude of posts and smarmy "*wink*, here's a link" replies, so I'm looking for actual help here, not condescending reprimands.

That notwithstanding, here is my problem.  I have developed a simple method that will open a local Word document, modify some header information, and then save the document as a new file.  As expected, it works great as a console/windows app, but as soon as I went to ASP.NET, DCOM jacked my world up when accessing the app remotely from a different domain account (that has access to the ASP.NET app.  For reference, my method is shown below:


1    public static string ModifyAndSaveBuildDocument(string localFilePath, BuildDocumentType docType, string buildNumber, DateTime buildDate, string projectName)
2            {
3                try
4                {
5                    ProjectConfiguration config = (ProjectConfiguration)ConfigurationManager.GetSection("ProjectConfiguration");

Stop Sorting Cross Tab Report Header


Dear, I want to stop sorting in cross tab report header. And also want to sort in specific order. How can i do that? Please help me. Its urgent


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