[Code] This is run from inside a backgroundworker. It throws an error, Cross-thread operation not valid: Control 'pbUpload' accessed from a thread other than the thread it was created on. I have read and read and searched and basically come to the conclusion I am going to have to invoke the command but this is new area for me.
View 5 RepliesI've got a form that has a ProgressBar on it. The Style is set to Marquee. In the Form.Shown event handler, I call BackgroundWorker. RunWorkerAsync(). In the old version, while this is occurring in the background, the ProgressBar is scrolling, which is exactly what I want.I copied over not only the code from within the file (i.e., the logic code) but also the code from the designer file. So, from what I can tell, there should be NOTHING different between the two files. However, in the new version, the marquee scroll doesn't occur.
View 6 RepliesI have to write a program that retrieve record from database, but everytime the screen will look like getting hang when getting large row record.I using the backgroundworker to prevent screen hang when retrieving record from database but why my progress not working when in progress? It only will show when the transaction done..
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I just have 1 listbox which got link in there. How can I download each file using background_worker + progressbar(current file download)?
View 5 Replieshow to load data into datagridview using backgroundworker & progressbar?Let's say i have a report that shows some statistics, or has 100 000 of rows that should be displayed and during the load i would like to show the data that is already loaded and not to frees the form.Same example like in SQL when you perform a select command from a table which has 100 000 of rows and while loading the data, the grid is already filled up and progressbar is shown at the left buttom side.
View 7 RepliesI am trying to use the background worker to keep my application responsive during the calculations it does. All I need is one to calculate and the other to count time which I use a timer for. But when I try to use a progress bar as well as I want to see the progress it gives me an InvalidOperationException: Cross-thread operation not valid: Control 'ProgressBar1' accessed from a thread other than the thread it was created on. I need this to work, how could I use a component from outside the background worker? This is the background worker bit:
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I have the download progress bar working in my program but I can't find any working code to determine the amount uploaded. here is my upload code
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I have a progressbar on my form that is not getting updated.
When the Send Email button is clicked I do this:
Public Sub SendMail()
If CheckSettings() = False Then Exit Sub
BackUpEbillFile()
LockForm(True)
StatusBars(1, "Sending emails...")
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I'm using Windows XP and VB.net 2005. I've search for information on how to use the BackgroundWorker to display a ProgressBar during a process and thought I had it correct, but appearently I don't - the bar never shows, much less moves. My goal is to have a Marquee Style progress bar display while my code is looping thru a query result populating a datatable that a DataGridView is binded. Here is my code.
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I have a class that downloads a specific file from the net.This class uses a BackgroundWorker. I tried to implement kleinma's Download Files From Web With Progressbar [URL]../showthread.php?t=396260), but I'm having difficulties making it work. I'm including a test project, so if someone is willing to take a look at it, it would be great .
The part I'm having trouble with is updating the progressbar and progress label. The errormessage I receive is in Norwegian, but it has something to do with threads. I suppose I should use Invoke or something, but I don't know where to start..
how to safely load a datagridview via a backgroundworker while showing progressbar feedback ? My data is coming from an access mdb.
View 4 RepliesI place some code below to simplify the process.
1) I am trying to use background worker to download a large file and update a progress bar to reflect the changes as the large 5GB file is being downloaded, and also update percentage completed to the label.text(lblInfo).
2) As I was goggling I came across some info that a web client is needed to calculate the maximum size of the file and divide by 100 and you can stream it down with the web client. Reading it is one thing, implementing it is another as I spent week trying to get it to work.
UCPocoAPoco
Imports System
Imports System.IO
Imports System.Diagnostics
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in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
I don't know what's wrong but in my code I can't show the cursor. .Hide() will succesfully hide the cursor but then .Show() does nothing.
If moveTimer.Enabled Then Windows.Forms.Cursor.Hide() Else Windows.Forms.Cursor.Show() : MsgBox("wdf")
Basically while the game is running, I need the cursor hidden. That part works, but when the game pauses, I need the cursor back and .Show() isn't working. I have a msgbox to check and make sure that the Else side actually executes when the game is paused, and it does so I know .Show() is executing.
I am making a program that can backup files and folders, i cant seem to get my progressbar to show correctly, is there a way (without showing the default windows copying progressbar) to get the total MB of all files and sub folders in a directory and then make a progressbar have max = MB and how to step this progressbar?If it is not worth it, it is not fun - you say programmers are boring but i say they are worth it.
View 5 RepliesI am using the notify icon to display a popup and i want to show a button and a progressBar in the popup if it is possible. If you've used yahoo messenger or msn messenger you know that when you recieve a call it shows you a popup and you can interact with it. Thats the kind of thing i want.
View 4 Repliesshowing MessageBox's from background workers.My program is a utility that has several functions and each function is boxed in a UserControl and then placed on a TabControl on the main form. A few of the utilities are batch functions that take quite a bit of time to complete their task. In order to allow the user to use the other utilities while a batch utility is running I make use of the BackgroundWorker class. It's quite handy!
My only problem is when I need the user to interact with the background thread, usually due to an error condition. I want to be able to halt the thread and display a MessageBox to the user. At first when you just do it from the background thread as demenstrated in the code below, it appears to work fine. But the MessageBox is not actually parented by the Form. If you select the Form, it will hide the MessageBox and the user thinks that the program has stalled. What's worse is that my program has a setting to allow the user to make the window TopMost, which means that the form will always hide the MessageBox when TopMost.
Option Strict Off
Public Class Form1
Private Sub chkTopMost_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkTopMost.CheckedChanged
Me.TopMost = chkTopMost.Checked
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I have thought about passing the message using ReportProgress(), but the problem with this is that the BackgroundWorker will not halt it's opperation, and there is no built in mechanisim to send a message back to the BackgroundWorker.
I am looking for a way to implement a PrograssBar on Application TaskBar item on Windows 7 as you can see in Windows 7 like when copying files! I need to do it with a few lines in Visual Basic .NET 2008. I know there is a Windows API Code Pack by Microsoft but it's a large collection and written in C#. How to do this in VB.NET without using a .dll reference?
View 2 Replieson page load i have a listbox which gets populated with the subfolders of a folder, im trying to have it so a progress bar fills as each item is added but im not having any luck with remembering how to do this And googles not been to helpfull.Heres my code so far:
vb Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ProgressBar2.Maximum = ListBox1.Items.Count
ProgressBar2.Minimum = 0
ProgressBar2.Value = 0
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I have a procedure that download a file in a background worker how can i show a tooltip in a notifyicon when the background worker have finished the work ?
Can i implement also a progressbar from the backgroundworker ?
I am doing a media player, based on WMP's controls..And i am trying to fix a progressbar that is working as a sort of a counter that show's where the music count is.And also what the name of the song is.and also trying to make all the songs would show without extension and the whole C:\music\mysong.mp3 instead having mysong.mp3
Public Class Form1
Private Sub import_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Importdiag.ShowDialog()
End Sub
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I have an app with 4 buttons that each generate a random number into textbox, before this number is entered i would like to have a progress bar at the bottom, well show that its processing basically.
View 4 RepliesI have a log in form, and once you log in, it's supposed to show a new form.
The problem here is...if I use Me.Close(), then both of the forms close, and the application terminates.
If I use Me.Hide(), than the first form doesn't actually stop running in the memory, and proceeds to run in the background even after you're done with the program.
I am using BackgroundWorker to connect asynchronously to a database. Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
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While my connection is being opened, I have a "Loading" animation show in a lblCalibration. Once it's connected, the animation stops successfully and shows the calibrated record that I am fetching from my db.
However, if there is an error while connecting to my db for any reason, it does not work. My app freezes. The reason is because I am trying to make a cross-thread call while trying to Catch the error in the DoWork event.[URL]..
but still cannot seem to make any progress. Does anyone have any tips or advice on how to properly catch the error and still run BackgroundWorker?
I have a search function in my program that uses a background worker in order to get the results. The Progress changed event is used to update the listview with the new item.[code]
View 2 RepliesI cannot figure this one out.. I have a background worker that will perform a task streaming data from some webpages. this data is then passed back and displayed in a gridview. It has been working fine.
I've recently implemented a listbox, which its values will be passed into the function that the background worker will perform as parameters, originally i had taken a single value from a textbox.
Now, I thought maybe it had something to do with the listbox, so I used a static value, just a simple String, as the parameter, and again, I get the TargetInvocationException was unhandled.. There's no difference in how I perform the task I'm trying to have the backgroundworker complete, the only difference is where it exists in my if condition statement:
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles ScrapeSites.DoWork
Dim results As ArrayList
Dim worker As System.ComponentModel.BackgroundWorker = DirectCast(sender, System.ComponentModel.BackgroundWorker)
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I am trying to use a progressbar to show on main form and then finish when next form is loaded, I have got this code.
1. When I click on button, it must open next form, but the next form must only open when the data in my list box has been loaded from Access Databse. When I run my program, it only shows the progressbar and don't open the next form.
Main form code:
Public Class Main
Dim PB As ProgressBar
Private Sub main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
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I have a windows form with a progress bar and a button to start/stop the process. I am performing some action when clicked on 'Start' and updating the ProgressBar accordingly and its working fine. But when I try to click on the 'Stop' button when the process is going on, I couldn't access the Window. If I click for multiple times, I am getting (Not Responding) on the titlebar.
Then, I created a thread and run the function (which performs my task and update the ProgressBar) in it. I am getting an error that it could not access the control which is created in another thread.
I have a project in VSTO/VB using a BackgroundWorker that works fine. It is a form that calls for a web page of information. The web page can take a while, so I have the form calling with the BackgroundWorker.I then have an Excel Addin project that has added the BackgroundWorker project. When I call up the form from the Excel Addin project and use the BackgroundWorker to request the web page, it grabs the web page ok. But the work done upon completion, during the BackgroundWorker1_RunWorkerCompleted method, is resulting in an error message:
View 2 RepliesI am using a background worker's work method to create a new form and show it.
But it throws this error
System.Threading.ThreadStateException was unhandled by user code
Message="Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it."
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