VB.Net by API/System.ComponentModel/BackgroundWorker

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BackgroundWorker.CancellationPending

  
Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class


BackgroundWorker.ProgressChanged

  
Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class


BackgroundWorker.ReportProgress

  
Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class


BackgroundWorker.RunWorkerAsync()

  

Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class


BackgroundWorker.RunWorkerCompleted

  

Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class


BackgroundWorker.WorkerReportsProgress

  
Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class


BackgroundWorker.WorkerSupportsCancellation

  
Imports System
Imports System.Data
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Data.SqlClient
public class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1
       Application.Run(form1)
   End Sub
End Class

Public Class Form1
    Private Sub btnStartProcess_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnStartProcess.Click
        btnStartProcess.Enabled = False
        btnCancel.Enabled = True
        prgLongProcess.Value = 0
        bgrLongProcess.WorkerReportsProgress = True
        bgrLongProcess.WorkerSupportsCancellation = True
        bgrLongProcess.RunWorkerAsync()
    End Sub
    Private Sub btnCancel_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles btnCancel.Click
        bgrLongProcess.CancelAsync()
    End Sub
    Private Sub bgrLongProcess_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ruponentModel.ProgressChangedEventArgs) _
     Handles bgrLongProcess.ProgressChanged
        prgLongProcess.Value = e.ProgressPercentage
    End Sub
    Private Sub bgrLongProcess_RunWorkerCompleted(ByVal sender As Object, _
     ByVal e As System.ruponentModel.RunWorkerCompletedEventArgs) _
     Handles bgrLongProcess.RunWorkerCompleted
        btnStartProcess.Enabled = True
        btnCancel.Enabled = False
    End Sub
    Private Sub bgrLongProcess_DoWork(ByVal sender As Object, _
     ByVal e As System.ruponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork
        For i As Integer = 1 To 10000
            For j As Integer = 1 To 10000
            Next j
            If bgrLongProcess.CancellationPending Then Exit Sub
            bgrLongProcess.ReportProgress(CInt(100 * i / 10000))
        Next i
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.btnStartProcess = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.prgLongProcess = New System.Windows.Forms.ProgressBar
        Me.bgrLongProcess = New System.ruponentModel.BackgroundWorker
        Me.SuspendLayout()
        "
        "btnStartProcess
        "
        Me.btnStartProcess.Location = New System.Drawing.Point(8, 8)
        Me.btnStartProcess.Name = "btnStartProcess"
        Me.btnStartProcess.Size = New System.Drawing.Size(75, 23)
        Me.btnStartProcess.TabIndex = 0
        Me.btnStartProcess.Text = "Start"
        "
        "btnCancel
        "
        Me.btnCancel.Location = New System.Drawing.Point(208, 8)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(72, 24)
        Me.btnCancel.TabIndex = 1
        Me.btnCancel.Text = "Cancel"
 
        Me.prgLongProcess.Location = New System.Drawing.Point(8, 48)
        Me.prgLongProcess.Name = "prgLongProcess"
        Me.prgLongProcess.Size = New System.Drawing.Size(272, 16)
        Me.prgLongProcess.TabIndex = 2
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(288, 75)
        Me.Controls.Add(Me.prgLongProcess)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnStartProcess)
        Me.Text = "UseBackgroundWorker"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents btnStartProcess As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents prgLongProcess As System.Windows.Forms.ProgressBar
    Friend WithEvents bgrLongProcess As System.ruponentModel.BackgroundWorker
End Class
Источник — «http://vbex.ru/index.php?title=VB.Net_by_API/System.ComponentModel/BackgroundWorker&oldid=2374»