Threads In Windows App?

Aug 17, 2011

I have a threading problem when it comes to updating the gui from the thread.

In my main function I have the following:

Private Sub StartThreads(Optional OrgName As String = "")

Dim blnMonitorEntered As Boolean = False

[Code]...

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Multithreading - .NET 4.0 Execute Multiple Threads But Threads Are Completed Before Resuming?

Oct 19, 2011

I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.

What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).

What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?

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Queue Threads - Spawn A Series Of 'child' Threads From A Loop

Dec 30, 2009

I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below

[Code]...

However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.

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.net - ASP.NET Two Threads, One Result?

Sep 14, 2011

I need to run TWO Threads in a web application, .NET. 3.5 Both methods MakeRedCars and MakeBlueCars need to run at the same time as both take 5 seconds. I have tried many example codes with very bad results. I dont need anymore than 2 threads. The main issue I am having is knowing how to wait till they are finished and also how to store the results from each.Each of the Methods do different things, one is a web request, one is a sql call.

Both methods return a list of(cars) for example do:

carList.addrange(MakeRedCars())
carList.addrange(MakeBlueCars())
for each car in carlist<br>
response.write(car.colour + "<r>")
next

I have implemented the answered below and with empty objects all works well, as soon as you hook in a database call that returns the data/objects studio does a JIT and crashes.

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.net - How Many Threads Can Run Concurrently

Jan 28, 2011

I can only run "so many" threads concurretnly, a notion which I have seen elsewhere.As a threading novoice, how can I determine the maximum number of threads to use? Or is this a "how long is a piece of string" question? What does it depends on? Hardware config or what?

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.net - Using GDI+ With Multiple Threads?

Apr 18, 2010

it would be best if I just copy and pasted the code (it's very trivial).

Private Sub Main() Handles MyBase.Shown
timer.Interval = 10
timer.Enabled = True
End Sub

[code]....

An exception, "The object is currently in use elsewhere", is raised during the tick event.

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.NET Scheduling Threads?

Oct 25, 2010

I am having an issue where I need to implement a type of thread scheduling... I'm looking to implement a list of tasks, each with a set time that they need to execute, and after the time is up they will execute the respective code that goes with that task. I would use a timer based solution, however, I don't think that it would be very efficient. There will be a very large list of tasks, some of which need to be executed within seconds of being placed in the list.

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Best List For 2 Threads?

Jun 10, 2010

I have 2 thread.One that put some data inside a list?the second that take out these data from the same list.what is the best "list" that allows one thread to put something inside and another one that take stuff out>

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Get Rid Of Background Threads?

Nov 7, 2010

My application generates some background threads to perform some slow jobs (a cycle of ask for a long process to a server - wait - download the result).

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How To Know All Threads Are Cancelled

Feb 25, 2009

I'm having a bit of an issue killing threads off and resetting my form. After starting the threads, everything runs fine. When I want to cancel the threads, the threads are all killed off "properly" using the Abortable Thread Pool, but how do I know that all the threads are dead? I've tried using both GetAvailableThreads and GetMinThreads compared against the thread count that should be running if they're all killed off, but I can't seem to get it to work. The only time I can get the GetAvailableThreads to return the "correct" number is if I freeze one thread and kill off the rest.

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How To Merge 2 Threads

May 28, 2010

I have a GUI that is running for a form, let's call it Class xWindow. It has finished processing data and is simply waiting for the user to press a button, i.e. the main thread has nothing to do. Just before it finished processing, it kicked started something that has a callback function which occurs in a new thread (e.g. a system timer or a Bonjour callback to say that a service has been found on a port). This callback occurs within the xWindow class.

[Code]....

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Keep Adding New Threads As Old Ones End?

Dec 22, 2010

Suppose I have created 70 "rule-finder" objects, and I want to run each one on data.This is a time-consuming process.The new computers with the I7 chip can run 7 processes in parallel, and so I was thinking of running 7 threads at a time. Asone thread ends, I would add another, until all 70 objects are used. When the last rule-finder has completed, I would resume the main course of the program.

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Let Two Threads Communicate With Each Other

Jun 1, 2009

how can I let two threads communicate with each other by using VB.net?

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Progress 'bar' Using Threads

Jan 25, 2010

I currently have a program that runs several "intense" queries. I added a textbox and presented status updates when a query was starting, eding and how many were left. This would suite my need, but the textbox doesn't actually display anything until all the queries are finished. It then displays all the updates at once. I'm assuming updating the textbox in another thread would solve this issue, and that is where I am lost. How can I use a thread that receives a message from the main form running the query and have it display it in the textbox?

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Ran Into Some Threads Tlaking About XML?

Feb 25, 2009

I'm making a Tabbed Web Browser, and I need favorites to add to this web browser, I was searching this forum for answers on how to do it and I ran into some threads tlaking about XML and how they are easily controlled, yet a little more complex. How do I do this? Where do I start?

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Threads In These Two Methods Different?

Jan 23, 2011

Take a look at the code below. Here I create a thread, set its name, and start it:

Private Sub fileCreated(sender As Object, e As FileSystemEventArgs)
Dim processFileThread As Thread = New Thread(AddressOf fileCreatedHelper)
processFileThread.Name = e.FullPath
processFileThread.Start()
End Sub

This is the sub that is the thread: Private Sub fileCreatedHelper()

[Code]...

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.net - Set CurrentPrincipal In Winforms For All Threads?

Jan 4, 2011

In a .NET 3.5 Winforms app, after a user provides a username and password, I set a custom principal in the CurrentPrincipal property like this:My.User.CurrentPrincipal = Service.GetPrincipal(username)This is done in a method that is called using Invoke, because the originating thread is not the UI thread:Invoke(New Action(AddressOf doLogin))But when I click on a button in the Winforms application, the CurrentPrincipal property has been reverted to its default, the current Windows user.Dim lPrincipal = My.User.CurrentPrincipal ' not my custom principalApparently, using Invoke while setting the principal does not solve the problem. Is there another way to set the CurrentPrincipal property for all threads in the application?

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.net - Threadpool Using Upto 200 Threads?

Jun 26, 2011

i have this code which i run with queued 10,000, even when a max of 50 is set but the threadpool counts goes to high.

Public Sub DoWork(ByVal objItem As Object)
Dim objUrl as String = DirectCast(objItem, string)
Try
If objUrl Is Nothing Then

[code]....

EDIT:i use a this code to check the number of runing threads each second

Sub Timer1Tick(sender As Object, e As EventArgs)
tsslthreads.Text=string.Format ("Threads: {0}", Process.GetCurrentProcess().Threads.Count)
End Sub

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2 Threads Not Working In Parallel?

Sep 28, 2010

I have 2 threads in my Program. Here is code for both of them

Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click

[Code]...

StartReceiving is working fine but StartWriting is called only once and that msgbox in startWriting is never called, any suggestions on this

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Add Two Numbers Up Using Threads Or Multithreading?

Jun 16, 2012

My question is to add two numbers up using threads or multithreading. Here is what I have:

Module Module1
Sub ThreadA()
Dim I As Integer[code].....

Is there a way I can use this somehow to add two numbers up?

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Binding And Threads In WinForms?

Oct 27, 2010

In my Winforms application, i've got a form and an associated business layer class. All controls are bound. When i click a button i call a method on the class which then starts a background worker and returns. The background worker does some processing and finishes.

The problem i'm having is that i'm using a label to display any error messages generated by this background worker, which is fine but after a set time i want to clear the label, so for that i'm using a timer (on the business layer class), which, when it fires, is on a different thread and thus should not update the property that the label is bound to Whats the best way to do update the label? -- Should i be using a delegate to update the property value, if so how do i invoke it?Note i'm also having a problem with getting the databinding of the visible property on this label to work.

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C# - String Concatenation And Threads In .NET?

Oct 18, 2011

In VB.net, I tested concatenating 100k strings and found out one thread alone did it in 23 milliseconds. Two threads (each concatenating 50k) then joining the two at the end took 30 milliseconds. Performance wise, it didn't seem beneficial to utilize multiple threads when dealing with only 100k concatenations. Then I tried 3 million string concatenations and two threads each handling 1.5MM always demolished one thread handling all 3 million. I imagine at some point using 3 threads becomes beneficial, then 4, and so on. Is there a more efficient way to concatenate millions of strings in .NET?

fyi, this is the code I wrote:

Imports System.Text
Imports System.Threading
Imports System.IO

[code]....

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Copy A File Between Two Threads?

Jan 18, 2012

My scenario is that I have a Windows service running as SYSTEM. That means no network rights by default. I want to copy a file from server A and server B. Both require different Credentials.Normally, I use Impersonation on one thread to access another server [URL]. The problem is that one thread can only impersonate as one user. And I need to access server B as well.So, I wonder about the best way to copy between two threads. I am interested in doing this in memory, for speed and I do not want to save a file locally on disk in between.

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Cross Link Two Different Threads?

May 4, 2010

this is sumit from Larsen & Toubro Mumbai-India,I am writing a code for some sort of software in which execution of some code is required as soon as my software receive a barcode from barcode scanner (serial input). Now through datareceived event handler i am able to read the barcode but after that i am not able to send this barcode to any textbox or even i am not able to start any other event like performclick to any button or anything. I am getting an exception as cross linking of threads not possible. please refer to the image and give me the solution asap.

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Find Threads In Application

Jun 7, 2011

I recently began working on an application that was built by someone that is no longer available. This application is filling an excel file, but I can not find ANY code that uses excel. There aren't even any references to excel interops. My thought is that this a multi-threaded application and I can't see what is going on behind the scenes. I tried watching the processes in the task manager, but found nothing.I've never worked with threads before, and do not even know where to begin. Debugging the program with breakpoints at multiple locations does not show me any of these other threads. Anyone have an idea on how to find/debug threads of a program?

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Forms :: Working With Threads?

Jan 9, 2010

Public Class ThreadSearch
Inherits frmStDetails 'Windows form which contains my control
Public Event finishedSearching()[code].....

This is the procedure I used to start the thread. It doesn't generates error but the problem is 'IT DOES NOTHING'.

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How To Run Multiple Threads With BackgroundWorker

Jan 13, 2010

I am writing a project in Visual Basic where I need to run several instances of the same method in parallel. I can do this using BackgrooundWorker by having several (4) copies of my code module (modules 1, 2, 3 and 4) with a call to background worker in each. I then have a Main form which invoke the 4 modules which setup 4 simultaneous background threads. Seeing as the code is the same I want to simply invoke the same module 4 times.

However when I do this I get an error from Backgroounworker that it is already busy. As I understand it this means that it is being shared. However, I have specifically instantiated it as "private" (private with events worker as new backgroundworker). I have tried running the same code in a Class instead of a Module but unless I make it public I have no way of invoking it from Main. I need to be able to pass each thread data from main for it to work on and if the class is private I cant invoke it.

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How To Stop Multiple Threads

Nov 6, 2010

This code will show you how I started multiple threads:

For i As Integer = 0 To 10
Dim MyThread As New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MySub))
MyThread.Start()
Next

Now I'm trying to stop the threads before closing my application but I don't know how to do that?

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Listening To UDP Broadcast With Threads?

Mar 11, 2009

I'm broadcasting a simple message to ..*.255 (changing to 255 the last part of my ip) and i'm trying to listen to it. the code returns no error but i'm not receiving anything. In wireshark I can see the broacast is sent correctly, but with a different port each time (I don't know if that's a big deal).

Here's some parts of my code.
Private Sub connect()
setip()
btnsend.Enabled = True
btndisconnect.Enabled = True
btnconnect.Enabled = False
receive()
[Code] .....

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Load Threads Via Value Do This With A Designated Value?

Jul 10, 2009

i've searched and searched on here for an example and couldn't find one... basically i'm new to vb.net and learning how to multithread now.i understand threading like

Dim Thread1 as New System.Threading.Thread(Address of workclass.Function)

but how would i do this with a designated value (integer, updownbox, etc.)?

Dim Threads() as New System.Threading.Thread(Address of workclass.Function)

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