VS 2010 Multi_Thread - How To Open Form2 In A 2nd Thread?
Jul 15, 2011
I have a form frmInvMaint which loads about 800 000 records from my Pick database. I have a 2nd form frmLoading with a animated gif on it. The reason for this is the application takes about 30seconds to return the selection from the DB. During that time, the application seems to be hanging (not responding). I added the frmLoading to show, before the selection executes. This way the user will see a animated loading gif on his screen, assuring him that the application is working in the background. My lame attempt on multi threading failed. The gif on frmLoading hangs, infact, the entire form hangs. Will multithreading fix this if done properly?
This is the code I used:
CODE:
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Aug 13, 2010
In 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".
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Oct 31, 2010
My routine to check for updates is run as a separate process. Exiting the application is required to update, so a dialog asks the user, when an update is found, if they want to exit now. f they do, the code (from the update thread) calls Application.Exit().However, if the FormClosed event of any form that needs to be closed needs to access its controls, an invalid cross-thread operation is detected (which sounds pretty logical).
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Mar 27, 2009
I have been converting my VB6 programmes to VB 2008, and I am beginning to regret it.According to the books that I am reading on the subject, I can call a second form from the first one. That is, when the first form code has completed, and the final line reads:
frmForm2.Show()
the second form should open and wait for input.This does not happen, the form flashes and then disappears without allowing any input, or button click.I must admit that I preferred being able to start from a module, with a Main() sub, which then read the forms, a la VB6. everything seemed to work fine then.
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May 25, 2009
i have 2 forms, in form1 i have a button that use to redirect to form2. [code] An error occurred creating the form. See Exception.InnerException for details. The error is: Navigation to a relative URL unsuccessful.
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Feb 4, 2012
When I hit the submit button I want the entered data to appear in textboxes on groupForm, but this isn't happening. I have to restart the form or hit the Refresh button for the data to appear.[code]...
I added groupForm.populate() at the end of the latter function for testing purposes, but I know that shouldn't be necessary ("populate" just loops over all items in the ProfitObjects array and calls NewProfitObjectsItem for each one).
Anyway; when I submit the data from the second form, the groupForm doesn't automatically show the new data. I either have to hit the refresh button or restart the form (it calls populate() on form load).
I simply want the new item to appear immediately after Submitting it. And it should, because that's what groupForm.NewProfitObjectsItem() does. And to top it off I added groupForm.populate(). I'm assuming it's not working because it's called from an external form, or because the other form is open/has the focus.
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Apr 25, 2010
I have two forms. Form 1 you click a button, and it opens Form 2. Form 1 is still open.
When you click a button on Form 2, I want to run a Private Sub that is on Form 1, whilst Form 1 is still open.
The idea is that the data i've entered on Form 2, once I close this form, I can continue working with Form 1 with the updated data without having to close and re-open it.
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May 30, 2009
im trying to open another form2/app that have music but i wanna stop the sound in form1 from playing when form2 open?
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Nov 29, 2009
Last one day I could not manage to pass data from one form2 other form.
When I am opening Form2 from Form1, I can pass data from Form1 to Form2.
When I am closing Form2, I want to pass data from Form2 to Form1 which is still open when I close form2.
I try to use shared textbox, but I understand that this is nt supported.
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Feb 19, 2010
What Im making is like a face book and tagged login from my app
1. I have Combobox with 3 urls in there ( Facebook.com Tagged.com and Bebo.com )
2. I have a Form2 with webbrowser
3. I have a Button when clicked it should open up my form 2 and preview of the website which I selected in my combobox in form1
All I'm trying to do is when I select lets say facebook in my form 1 and click load it should open up my form 2 with facebook website in it.[code]Now when I click my button in form 1 it will load Form2 ( named Explorer1) but my form2 is not showing me facebook or tagged page for some reason
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Oct 4, 2011
I am trying to do an if then statement on form2 that references timer1 on form1, something like...if form1.timer1_tick then the problem is that I have never worked with a second form before and I am not quite sure on how to achieve this?
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Mar 27, 2012
So I need to show form2, take screenshot, hide form2. But it's kinda not really working.
Here are my codes below:
[Code]....
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Mar 26, 2012
I'm making an autotyper/spambot, these may seem wrong to a few or most of you but it's a $50 bet to me. But anyway, I have the controls on form 1, (TextBox1 + Start + Stop (user input), ComboBox1 + Start + Stop (For pre-defined input.)) and the pre-defined text on form2. But I have a problem with the combo box reading the data on form 2.
Example:
On timer2_tick
Sendkeys.Send(Form2.textbox1.text)
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Jun 26, 2011
I've got a program that runs from one Windows form, Form1, with stuff declared all in that class: public variables, public functions, subs, etc. I decided that the form was getting cluttered, so I added one button to bring up a new form, Form2, and I put some of the buttons & check boxes for testing over there, so that Form1 can be more visually clean. Problem: when I go to put the code for the tests into the buttons on Form2, none of the public variables or subs or functions that reside in Form1 are visible in Form2. What statement/s do I need to add (and where) so that the public "stuff" that's declared in the class for Form1 is visible within Form2, please?
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Dec 15, 2009
I have 2 forms. On form1 i have listview on form2 i have menu. I'd like to call form2 menu from Form1 ListView1_MouseUp. I tryed to use this code
[Code]...
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Sep 16, 2010
I am trying to give some user entertainment, and show a "please wait" window, with Marquee, during the loading of a separate complex Window. I am attempting to do this by loading the Window in a new thread, like this:
Public Function ShowPleaseWait() As System.Threading.Thread
Dim PleaseWait As New System.Threading.Thread(AddressOf LoadPleaseWait)
PleaseWait.SetApartmentState(System.Threading.ApartmentState.STA)
[code]....
In the calling code, it calls ShowPleaseWait and saves the Thread for later.. To close the window, it calls Thread.Abort, on the saved thread. This in turn will causes it to enter the Catch. I have tried, many different ways, with and without the catch.This works incredibly, the first time it is called. However, additional calls will fail at window.Show() with the exception: The calling thread cannot access this object because a different thread owns it..This really puzzles me as the window was created one line above the call to window.Show and is local. How is it owned by a different thread? How can I fix this?
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Nov 18, 2011
I am Matthew and I'm extremely new to coding and any sort of scripting language; yet I am highly interested in programming and want to learn lots about this subject. So to start myself off I am trying to create some applications which I could use in day-to-day life to just basically make life easier.So the first program I am trying to make I am already confused and not sure what the heck I have to do in order to get it functioning, I've looked on lots of videos on you tube for tutorials and they have all done a great job but some videos just don't answer my questions.When I click a button and "Form2.Show()" appears, how can I make it so that when I type text in a list box in form2, it doesn't disappear when I close it? Then once I have known done that, how can I make it so I can choose a random string of text in the list box on form2 to show up on the click of a button on form1? Then a final question is, How do I prevent fields being reset in form1 & form2 on program close? Also, is it ok for me to make a thread asking 1 simple question? or do I have to ask a handful each time to save threads or something?
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Nov 3, 2011
This is the error message I am getting:
"Cross-thread operation not valid: Control 'Panel1' accessed from a thread other than the thread it was created on." The reason I am getting this error is because I am opening up a new form and then calling these three things:
Panel1.Show()
Label1.Show()
Label2.Show()
why I get this error message because it doesn't occur normally if I open Form2 after closing Form1, it only occurs when I open Form2 after closing Form4.
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Jul 21, 2009
I have done a program using vb2005 to display reading from my microcontroller bs2 board but have encountered some problems. My code are as follows.
Dim Stop_Rx As Boolean
Private Sub btnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRead.Click
SerialPort1.Open()
[code]....
I've encounter an error which is, (Cross-thread operation not valid: Control 'txt1' accessed from a thread other than the thread it was created on.)
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Jun 21, 2012
When my client try to connect to server I'm getting this error : Cross-thread operation not valid: Control 'l_users' accessed from a thread other than the thread it was created on.
Private Sub _socketManager_onConnectionAccept(ByVal SocketID As String) Handles _socketManager.onConnectionAccept
l_Users.Items.Add(SocketID)
End Sub
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Feb 17, 2012
Would anyone be able to help me here please. I'm fairly new to VB.net and threading so im just trying to figure out what is happening.When I debug this I am getting the error thread operation not valid: Control 'ProgressBar1' accessed from a thread other than the thread it was created on.
I'm a little lost as to why the error is occuring or how to fix it. I've had to put the progress bar in a separate thread otherwise the GUI crashes
[Code]...
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Sep 2, 2010
My understanding is that thread.join will suspend the execution of code on the calling thread until the spawned thread finishes or is aborted...
With that in mind, I tried this:
For i = 1 to 50
threads = New Thread(AddressOf test)
threads.IsBackground = True
threads.SetApartmentState(ApartmentState.STA)
[CODE]...
However, the rest of the code runs when the loop finishes, not waiting for all the spawned threads to finish. Since the rest of the code needs the threads to finish (otherwise the rest will error).
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Jun 6, 2010
I have written an application that loads a form - frmCad as well as AutoCad. It does this via a class which detects when AutoCad quits.
Friend Class CadApp Private WithEvents AppObject As AcadApplication... Private Sub AppObject_BeginQuit(ByRef Cancel As Boolean) Handles AppObject.BeginQuit RaiseEvent Quit() End SubEnd Class
My main class loads frmCad as well as CadApp.
Public Class Cad Private WithEvents frmCad As CadForm Private WithEvents app As CadApp... Public Sub ShowForm() If frmCad Is Nothing Then frmCad = New CadForm frmCad.Visible = True End Sub... Private Sub app_Quit() Handles app.Quit frmCad.Dispose() frmCad = Nothing .... End Sub
When I debug the program, it stops at frmCad.Dispose()The program continues to execute, but all the code after it fails to work.Looking more carefully I get an error message which contains:-Cross-thread operation not valid: Control 'Autocad' accessed from a thread other than the thread it was created on.
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Feb 9, 2011
My error:Cross-thread operation not valid: Control 'label2' accessed from a thread other than the thread it was created on. I want to be able to give my Public RunBot() sub access to edit Labels, buttons, etc without an error.
[Code]...
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Apr 1, 2010
I'm getting the 'System.InvalidOperationException' error on acccessing a thread from other than where it was created. My code is:
'Required by the Windows Form Designer
Public components As System.ComponentModel.IContainer ' changed from private
[code]....
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Jun 6, 2009
My problem is Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on.
System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'statusHO' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
StackTrace:
[Code]...
i used it and it works fine then. but as it is mentioned its not a good practice to use it. So what should i do? is it ok if i use this as i am not able to use correct practice. Mine application is not for enterprise purpose. its just my class project, and it works fine even if i put application working in background. System works ok. I dont know how to correct this error.As i dont have that much knowlege of threads.
So please guide me how to fix this in correct way otherwise i am force to go for bad programming practice
Please refer to Windows Mobile Developer Center > Smart Device Development Forums > Windows Mobile Development > Appendtext not working for all my code details
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Aug 4, 2009
Cross-thread operation not valid: Control 'lv1' accessed from a thread other than the thread it was created on.
Dim lvi As ListViewItem
For Each lvi In lv1.Items
[code]....
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Feb 15, 2012
In my scenario when i press the "Get Book Details " of the Form1 , it will redirect to the Form2 , in the form load of Form2 a datagridview is filled with values along with the checkbox column and the desired rows of all the columns are selected and when OK button(form2) is pressed the selected rows should get populated to the datagridview of the form1.But i m not getting the selected rows to the form1t.
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Mar 11, 2010
Private Sub LinkClicked(ByVal sender As Object, ByVal e As EventArgs)
Dim link As HtmlElement = WebBrowser1.Document.ActiveElement
Dim url As String = link.GetAttribute("href")
[code]...
Okay so here's the question how do I get the links that open in a new window to open in my main webbrowser control. The above code does some, but it's not fool proof.
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Feb 7, 2011
Ok i have a Form with the following
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
txtNotepad.Text = LoadFile("notes.txt")
[code].....
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