VS 2008 - Selecting A Tab In A Thread
Apr 25, 2012I'm getting this error when try do a simple task of selecting a tab in a thread. What does it mean and how do you solve it? [Code]
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VS 2008 System.Thread.Thread.Sleep Not Working?
Mar 22, 2010Im trying to do this
[Code]...
But it will just skip to the last status (Label3.Text = "Status: Welcome")
VS 2008 Terminate A Threading.thread Using Thread.abort?
Jun 10, 2010im trying to terminate a threading.thread using thread.abort the thread runs a download connection so is usually in the middle of socket.recieve or socket.send or socket.connect when aborting i just want to terminate the thread no matter what thread.abort raises an MDA excpetion. so i ticked it off in the debug exceptions menu. now it doesnt raise an exception, but the thread simply wont terminate. my program wont close unless i press top in the debugger.i cant pause downloads because i cant terminate the thread this code wasn't working?
Dim vT As Threading.Thread
For Each vT In clsDownloader.DownloadThreads
If Not vT Is Nothing Then
vT.Abort()
[code].....
as for the exception concerning threads being aborted from other threads being dangerous, how is it possible to send a message from a main thread to another thread to abort itself? as far as i know the only way to a abort one thread from another is to just kill it (because i dont know of ways for a thread to communicate with another).
VS 2008 Detect Thread End In Thread Parent
Oct 7, 2010I'm firing a thread to unzip a file. I need some way of indicating to the parent that the unzip thread has ended. I've tried raise event in the unzip thread to a sub in the parent but this runs the sub from the unzip thread. With ApartmentState set to STA, so that I could use a save dialog, this was OK until I displayed a messagebox which was hidden behind the main UI(and whatever I did I could not get it to the front).
View 11 RepliesVS 2010 Error - Cross-Thread Operation Not Valid: Control TbPlaca1 Accessed From A Thread Other Than The Thread It Was Created On
Aug 13, 2010In 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".
Cross-thread Operation Not Valid: Control 'Panel1' Accessed From A Thread Other Than The Thread It Was Created On." ?
Nov 3, 2011This 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.
Error - Cross-thread Operation Not Valid: Control 'txt1' Accessed From A Thread Other Than The Thread It Was Created On
Jul 21, 2009I 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.)
Error : Cross-thread Operation Not Valid: Control 'l_users' Accessed From A Thread Other Than The Thread It Was Created On
Jun 21, 2012When 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
Threading Progress Bar In .net - Thread Operation Not Valid Control 'ProgressBar1' Accessed From A Thread Other Than The Thread It Was Created On
Feb 17, 2012Would 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
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Waiting For Threads - Thread.join Suspend Execution Of Code On Calling Thread Until Spawned Thread Finishes Or Is Aborted
Sep 2, 2010My 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).
Cross-thread Operation Not Valid: Control 'Autocad' Accessed From A Thread Other Than The Thread It Was Created On
Jun 6, 2010I 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.
Cross-thread Operation Not Valid: Control 'label2' Accessed From A Thread Other Than The Thread It Was Created On?
Feb 9, 2011My 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]...
Cross-thread Operation Not Valid: Control 'lblStatus' Accessed From A Thread Other Than The Thread It Was Created On
Apr 1, 2010I'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]....
Cross-thread Operation Not Valid: Control 'statusHO' Accessed From A Thread Other Than The Thread It Was Created On
Jun 6, 2009My 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
Cross-thread Operation Not Valid: Control 'lv1' Accessed From A Thread Other Than The Thread It Was Created On?
Aug 4, 2009Cross-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]....
Error Saying "Cross-thread Operation Not Valid: Control 'lblOnline' Accessed From A Thread Other Than The Thread It Was Created On."?
Feb 7, 2011Ok 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].....
VS 2008 Selecting Value From .xml
Aug 26, 2009i can write the xml i need which looks like:[code]This shows me the value fine! when i change the attribute name to another field like: MessageBox. Show((XMLItem.Attributes("postingHiddenFieldsCount").InnerText))i get a null reference error,
View 9 RepliesVS 2008 Selecting A Label?
Jan 13, 2010This is another question on my who wants to be a millionaire game.I have 15 questions per game, when i select question 1 , it displays the question in the textbox, how do i tell vb that if "A" (label1) is selected then msgbox "Final answer ?"
i know i can do it on label1 click event , but i want the results for this question only.
Heres what i tried: Private Sub question1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles question1.Click
[Code]...
2008 - Underline Text On Selecting
Mar 15, 2009i have a button and what i select i want to be underlined. is it possible to do it?
View 11 RepliesVS 2008 - Selecting All ComboBoxes In Form
Nov 1, 2009I need to select all the comboboxes on a form with a for each loop. I have about 19 comboboxes and I need to select each one. I tried to do
for each box as combobox in me.controls
But that gave me an error and i now tried this:
for each box as control in me.controls
if box.name.contains("ComboBox") then
...
end if
next
That selected only the comboboxes but the problem is i need to access some data that is specific to comboboxes (aka the selected item(s), if its blank) but those properties are not present since "box" is a control, not a combo box.
VS 2008 Selecting A Number Between 2 Numbers
Dec 8, 2009i have 2 labels that are 1 for minimum damage and the 2nd for maximum damage,how do i make it so if when a person clicks a button it deals damage between the 2 [code]so if i press the button it were to deal (subtract) damage in between the 2 numbers. from a label box (opponent health)
View 16 RepliesVS 2008 Selecting Option Value Using Webbrowser?
Apr 14, 2009I am pretty familiar with how to use the webbrowser control. I know how to autofill forms using the getelementbyid code but I'm having a problem selecting from drop down menus.
Here is the html source
<select name="birthday_mon">
<option value="0">---</option>
<option value="1">January</option>
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VS 2008 Selecting Text In ToolStripTextBox?
Nov 2, 2009I am placing 2 of these on my form and want to do the following:
1. When the control is not Focused and the user clicks inside the control, I want to highlight all text within the control. I expect to use SelectAll() to accomplish this.
2. When the control IS Focused and the user clicks inside the control, I want standard actions to occur; i.e., the user can click-and-drag to highlight, double-click to highlight,
3. When the user leaves the control (clicks on something elsle), if the control is empty, I want to populate it with pre-defined text. If it's not empty, leave text as-is.
I'm having problems, though, with figuring out #1 and #3. I have tried Enter/Leave, GotFocus/LostFocus to no avail. With Enter/Leave, the text will highlight the first time a user enters the control, but I can't seem to get the program to think the user has "left" the control. That is, the "Enter" code will not fire again.
I also thought about using the Click event, but I don't want the SelectAll() code to fire for EVERY click in the TextBox controls.
VS 2008 Using Sql Parameters For Selecting From Sql Server?
Apr 17, 2010i know how to use parameters on INSERT, UPDATE and DELETE into sql server.like:
VBNet
updateCMD = "UPDATE table SET somevalue= @valueparam1 WHERE ID = 2"
Adapter.SelectCommand = New SqlCommand(updateCMD)
[code]....
VB 2008 - Selecting A Process And Send Data
Jun 9, 2010[Code]...
I'm doing an application where I open a specific process. And after opening that process I need to send data to him like username and password.
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VS 2008 Move A Control By Selecting Its Borders?
Nov 27, 2009how to move a textbox or any control by selecting its borders like in ms publisher 2007 and creating an application like publisher
View 3 RepliesVS 2008 Populate A Form By Selecting A GridView Row
Mar 10, 2010I have a typical data entry form to show one Customer. All textboxes, controls, etc. are bound to a BindingSource.
Clicking a button, I pop up another form with a DataGrid to show all Customers in a table, this way:
VB
Sub btn_Click
Dim frmPopUp As New frmSearch
frmPopUp.BindingSource1.DataSource = Me.BindingSource1
[Code].....
How can I populate the fields in Form1 selecting a row of the grid in frmSearch?
What I need, is to synchronize the databindings (I think).
VS 2008 Selecting A Customer From A Listbox Of Surnames?
Mar 24, 2010I'm selecting a customer from a listbox of surnames...I need to address to display, and the date arrived back...Can't get anything to go into the textboxes, if dr.hasrows is showing up as none I think... not sure how to go about remedey"ing" it though...
Listbox
Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
Dim ConnectionString As String
[code]....
VS 2008 Selecting Random Images From A Directory?
Feb 4, 2010Heres the code im using to select images from a directory , i also have a timer delay between each image , but my problem is when i start my app , it start by selectind image 1 (Images are numbered 1-15) but i want to select the images randomly ?
Private Declare Auto Function SystemParametersInfo Lib "user32.dll" (ByVal uAction As Integer, ByVal uParam As Integer, ByVal lpvParam As String, ByVal fuWinIni As Integer) As Integer
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VS 2008 SQL SELECT Command - Selecting A Value From The Database
Feb 24, 2011I posted a while ago about having issues with a database, and selecting a value from the database. I was told that there were things missing from my code, and I've not gone back and added the things I was advised to. Now, my code seems to be working more, but outputting the wrong value.
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