VB.Net Tutorial/GUI Applications/Applications

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Applications.DoEvents

<source lang="vbnet">Imports System.Windows.Forms public class ApplicationDoEvent

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Private Sub btnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGo.Click
       Me.Cursor = Cursors.WaitCursor
       tmrLongTask.Enabled = True
       btnGo.Enabled = False
       Application.DoEvents()
   End Sub
   Private Sub tmrLongTask_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrLongTask.Tick
       tmrLongTask.Enabled = False
       Me.Cursor = Cursors.Default
       btnGo.Enabled = True
   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.ruponents = New System.ruponentModel.Container
       Me.btnGo = New System.Windows.Forms.Button
       Me.tmrLongTask = New System.Windows.Forms.Timer(Me.ruponents)
       Me.SuspendLayout()
       "
       "btnGo
       "
       Me.btnGo.Location = New System.Drawing.Point(16, 16)
       Me.btnGo.Name = "btnGo"
       Me.btnGo.Size = New System.Drawing.Size(48, 23)
       Me.btnGo.TabIndex = 0
       Me.btnGo.Text = "Go"
       "
       "tmrLongTask
       "
       Me.tmrLongTask.Interval = 3000
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(292, 273)
       Me.Controls.Add(Me.btnGo)
       Me.Name = "Form1"
       Me.Text = "UseWaitCursor"
       Me.ResumeLayout(False)
   End Sub
   Friend WithEvents btnGo As System.Windows.Forms.Button
   Friend WithEvents tmrLongTask As System.Windows.Forms.Timer

End Class</source>

ProgressBars and Application.DoEvents

<source lang="vbnet">Option Strict On imports System imports System.Drawing imports System.Windows.Forms public class ProgressBars : inherits Form

 dim pb as ProgressBar
 dim lbl as Label
 public sub New()
   Size = new Size(300,200)
   dim btn as new Button()
   btn.Parent = me
   btn.Text = "&Start"
   btn.Location = new Point(0,0)
   AddHandler btn.Click, AddressOf btn_OnClick
   lbl = new Label()
   lbl.Parent = me
   lbl.Size = new Size(100,23)
   lbl.Location = new Point(0,25)
   lbl.BorderStyle = BorderStyle.FixedSingle
   lbl.TextAlign = ContentAlignment.MiddleCenter
   lbl.Text = ""
   pb = new ProgressBar()
   pb.Parent = me
   pb.Location = new Point(0, 70)
   pb.Size = new Size(400, 20) 
   pb.Minimum = 0      "  the default value
   pb.Maximum = 100    "  the default value
 end sub  "  close for constructor
 private sub btn_OnClick(ByVal sender as object,ByVal e as EventArgs)
   dim cntr as integer = 0
   pb.Value = 0
   pb.Step = 1
   for i as integer = 0 to 100000
     cntr  = cntr + 1
     if cntr mod 100 = 0 then
       lbl.Text = cntr.ToString()
       pb.PerformStep()
       Application.DoEvents()
       System.Threading.Thread.Sleep(40)
     end if
   next
 end sub
 public shared sub Main() 
   Application.Run(new ProgressBars())
 end sub

end class</source>