Question

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...")
    ProgressBar1.Maximum = intInvoicesToSend  
    BackgroundWorker1.RunWorkerAsync()
End Sub

I have the following events:

Private Sub BackgroundWorker1_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
    e.Result = SendBills()
End Sub

Private Sub BackgroundWorker1_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
    Console.WriteLine("I DID IT MA!!!!1 status: " & ProgressBar1.Value)
    ProgressBar1.PerformStep()
    Console.WriteLine("I DID IT MA!!!!2 status: " & ProgressBar1.Value)
End Sub

In the SendBills, which is in a mail class, I do this:

smtp.Send(msg)
Console.WriteLine("I DID IT PA!!!! count: " & iCount)
frmBilling.BackgroundWorker1.ReportProgress(iCount)

My problem lies at the ProgressBar1.PerformStep() in the ProgressChanged. I am getting to the progress changed but the Progressbar1 is not changing. It stays at zero.

• intInvoicesToSend is 16
• ProgressBar1.Minimum = 0
• ProgressBar1.Maximum = intInvoicesToSend (which was 16)
• ProgressBar1.Step = 1

Here is my console from the console.writelines:

I DID IT PA!!!! count: 0

I DID IT MA!!!!1 status: 0

I DID IT MA!!!!2 status: 1

I DID IT PA!!!! count: 1

I DID IT MA!!!!1 status: 1

I DID IT MA!!!!2 status: 2

I DID IT PA!!!! count: 2

I DID IT MA!!!!1 status: 2

I DID IT MA!!!!2 status: 3

I DID IT PA!!!! count: 3

I DID IT MA!!!!1 status: 3

I DID IT MA!!!!2 status: 4

Can anyone tell me what I’m doing wrong?
Thanks!

Answer 1

My suspicion is that you’re calling the ReportProgress method on the wrong instance.

See this line:

frmBilling.BackgroundWorker1.ReportProgress(iCount)

If the BackgroundWorker is defined directly within your form, you can leave off the frmBilling portion, and just specify this as:

BackgroundWorker1.ReportProgress(iCount)

The way you have it may be causing the ReportProgress to get called on the wrong instance…