BackgroundWorker To Update Progressbar And Label While Downloading Large File
Mar 10, 2012
I 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
[code]....
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Nov 11, 2011
I just have 1 listbox which got link in there. How can I download each file using background_worker + progressbar(current file download)?
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Aug 7, 2009
How can i make a downloading file app with a progressbar in it.
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Jul 29, 2010
I am trying to learn Background worker and have written up a very simple app to understand this process. My form has a
textbox and a label. When the user clicks on the button, it updates the label with the value that they have entered into the textbox(I know this can be done elsewhere in the code besides the dowork event, I am just
testing and learning). Please help..I am not sure what I am missing. The label does not update.
[Code]...
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May 23, 2011
I have created a simple Backgroundworker process to copy a large file (30GB). Is there any way to report the progress of that file copy?
I'm using System.IO.File.Copy to perform the copy. I've seen a few posts/blogs that suggest comparing the bytes copied with the size of the source file but that seems like a huge overhead in this case.
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Apr 3, 2010
How to Use of Backgroundworker while open a large text file
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Apr 16, 2009
Update my application by downloading a file from web? When my program first loads i have this[cod]e...
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Nov 26, 2009
I'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.
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Aug 31, 2009
I 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..
[Code]...
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Aug 23, 2010
how 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.
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Feb 22, 2011
I 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:
[Code]....
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Sep 24, 2009
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
[code]...
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Aug 15, 2011
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...")
[Code]...
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Aug 8, 2009
[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.
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Sep 14, 2010
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.
[Code]...
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Oct 14, 2009
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..
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Apr 7, 2008
how to safely load a datagridview via a backgroundworker while showing progressbar feedback ? My data is coming from an access mdb.
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Nov 19, 2010
I have a Windows Form1 with label and i want to update the Form label text from the class file. I can able to get the Form1 controls from the class file but it is not updating the value in the Form. VB.net
Below is the Form1:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
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Feb 8, 2012
Private Sub btnBeginScan_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBeginScan.Click Dim db As New byrndbDataContext
[Code]...
The progressbar runs perfectly, but the lbImagesScanned.Text isn't updated until all the scans are completed.
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Dec 1, 2010
Now I upload update to a share folder inside the company network I have full
Permission access & everyone read onlyas any one out side the company can't use the program so there no password on the share folderbut I need now to protect the share folder as I have to use real IP on the database connection to allow the company branch's to access the database
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Jun 13, 2011
have a formthat hasa BackgroundWorker,on the do_work event i exe an SP:
Dim result As IAsyncResult = cmd.BeginExecuteNonQuery()
Dim rowCount As Integer = cmd.EndExecuteNonQuery(result)
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Mar 3, 2011
I just want to to change a label name from the backgroundworker, the code is plain simple:
label1.text = WebBrowser1.DocumentTitle and the error returned would be "Specified cast is not valid".
Now running the code from a button would do the job, but from the bgworker not, and I can't seem to get around it.
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Jan 25, 2012
vb
Public Class ProgressBar
Private Sub Press_Click(sender As System.Object, e As System.EventArgs) Handles Press.Click
Count()
End Sub
[code]....
I want LABEL ProgressNum to show the updated ProgressBar.Value but it just stays at 100 forever. Why?
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Sep 9, 2010
I was trying to use application.restart() to restart my application after downloading a new update. It seems to run into the problem where it is trying to start the new application before the original is closed so it errors out and never starts. After reading through some threads here I determined the better way to handle it would be
application.exit() process.start(application.executablepath) This didn't work and gave me what seems to be the same problem. I would also like to note this works fine when running the application through visual studios, it is only when I try to run this independent of VS2010 that the application never restarts.
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Feb 22, 2009
when i run following code it runs ok and problem is that during running code when i minimize the form and then restore again the form, it not display changing value into label1 and progressbar also the form looks like hang what is its solution?
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Apr 1, 2011
Main form loads and displays a table of records. Form1_load goes through each record and looks up external data for updates and this takes noticeable time. I have a splash screen that comes up while the main form is loading and I want the splash screen to display the status in a progress bar named ProgBar. I recall the method used a 'delegate' and my SplashScreen1 uses this code:
Delegate
Sub UpdateBar(ByVal
X As
Long)
[Code]....
The main form already loops through each record and all I want it to do is update the progress bar if the splash screen is open.
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Jun 29, 2011
I am writing an application that calls data collectors (via ip or modem), collects data from them and reformats it. I had this much written when I was asked to make it multi-threaded so that I can collect from multiple sites at one time. I have that written using backgroundworkers and it appears to be working well. On my UI I have a text box that needs to update with status details like, dialing, collecting, reformatting, etc. I planned to simply write the status updates to the text box from an UpdateStatus routine. Found that had all sorts of nasty threading issues, so I added a delegate to call the status update routine. Problems seem to be fixed except that the updates to the UI are coming in chunks instead of one by one as they really occur. Can anybody tell me how to force the status update in the text box to update more asynchronously?
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Jul 10, 2009
I know the reason of getting this error" Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on"
Is there any solution other than raising .ReportProgress event to update the form?
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Feb 22, 2012
I have a backgroundworker doing everything I want it to but I cannot seem to figure out how to get a listbox in the Windows Form to update from the worker. I have tried an number of things and have looked high and low, but I seem to be missing something. Is there a simple way to do this? here is a bit of my code:
[Code]...
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Aug 8, 2011
I'm having trouble getting a progress bar to update. I'd be okay just with a moving marquee bar. Basically, I'm reading a database routine in a SqliteReader.vb class. I need to use the worker_DoWork routine, but I'm not sure how to expose my variables coming from Form1: graphData, graphComputations, m_debug to the worker_DoWork sub. How is this usually done? [Code]
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