Background Worker

Form1.vb

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        BackgroundWorker1.RunWorkerAsync()
        Button1.Enabled = False
        Button2.Enabled = True
    End Sub

    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Dim i = 0
        While (i < 10 And BackgroundWorker1.CancellationPending = False)
            i += 1
            BackgroundWorker1.ReportProgress(i * 10)
            My.Computer.Network.Ping("google.com")
        End While
        If BackgroundWorker1.CancellationPending = True Then
            e.Cancel = True
        End If
    End Sub

    Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
        ProgressBar1.Value = e.ProgressPercentage
        Label1.Text = e.ProgressPercentage & "%"
    End Sub

    Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As System.Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
        If e.Cancelled = True Then
            Label1.Text = "Cancelled"
        Else
            Label1.Text = "Done!"
        End If
        Button1.Enabled = True
        Button2.Enabled = False
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        BackgroundWorker1.CancelAsync()
    End Sub
End Class