Late Binding Issue with BackgroundWorker in VB.Net - vb.net

Question

I am running a BackgroundWorker, and want to report its progress. In the example below I create a test list which the BackgroundWorker then iterates through. The problem lies in the line 'sender.ReportProgress(i)'. If I have Option Strict on, it does not like my use of 'i' due to Late Binding issues. Is there any alternative way to code this and avoid that issue?
Public Class Form1
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
' Configuring for Background Workers
Control.CheckForIllegalCrossThreadCalls = False
Dim MyList As New List(Of String)
For a As Integer = 0 To 100
MyList.Add(CStr(a))
Next
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim bgw As New System.ComponentModel.BackgroundWorker
bgw.WorkerReportsProgress = True
bgw.WorkerSupportsCancellation = True
AddHandler bgw.DoWork, AddressOf bgw_DoWork
' I create a BackgroundWorker here rather than add one in the toolbox so that I can specify the Handler and use different Handler routines for different part of a large program.
Button1.Enabled = False
Dim progress As New Progress(bgw)
progress.ShowDialog()
Button1.Enabled = True
End Sub
Private Sub bgw_DoWork(sender As System.Object, e As System.ComponentModel.DoWorkEventArgs)
For i = 0 To MyList.Count -1
Label1.Text = MyList(i)
sender.ReportProgress(i)
System.Threading.Thread.Sleep(200)
Label1.Refresh()
Next
End Sub
End Class
Public Class Progress
Private WithEvents _BGW As System.ComponentModel.BackgroundWorker
Public Sub New(ByVal BGW As System.ComponentModel.BackgroundWorker)
_BGW = BGW
InitializeComponent()
End Sub
Private Sub frmProgress_Shown(sender As Object, e As System.EventArgs) Handles Me.Shown
If Not IsNothing(_BGW) Then
_BGW.RunWorkerAsync()
End If
End Sub
Private Sub _BGW_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs) Handles _BGW.ProgressChanged
ProgressBar1.Value = e.ProgressPercentage
Label1.Text = e.ProgressPercentage
End Sub
Private Sub _BGW_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles _BGW.RunWorkerCompleted
Me.Close()
End Sub
End Class

Answer 1

CType(sender, BackgroundWorker).ReportProgress(i)

Answer 2

Also, if you want to do multiple actions with it, then create a local reference variable like this:
Private Sub bgw_DoWork(sender As System.Object, e As System.ComponentModel.DoWorkEventArgs)
Dim bgw As System.ComponentModel.BackgroundWorker = DirectCast(sender, System.ComponentModel.BackgroundWorker)
' ... now you can use "bgw" multiple times below instead of casting each time ...
For i = 0 To MyList.Count -1
Label1.Text = MyList(i)
bgw.ReportProgress(i)
bgw.SomethingElse()
bgw.MoreStuff()
System.Threading.Thread.Sleep(200)
Label1.Refresh()
Next
End Sub
Obviously this isn't necessary in your case, just an FYI...