VB.Net/Event/Mouse Draw

Using the mouse to draw on a form

Imports System
Imports System.Drawing
Imports System.Windows.Forms
Public Class MainClass
   Shared Sub Main()
        Dim myform As Form = New FrmPainter()
        Application.Run(myform)
   End Sub " Main
End Class
Public Class FrmPainter
   Inherits System.Windows.Forms.Form
   Dim shouldPaint As Boolean = False
#Region " Windows Form Designer generated code "
   Public Sub New()
      MyBase.New()
      "This call is required by the Windows Form Designer.
      InitializeComponent()
      "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "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()
      "
      "Form1
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(292, 273)
      Me.Name = "Form1"
      Me.Text = "Painter"
   End Sub
#End Region
   Private Sub FrmPainter_MouseMove( _
      ByVal sender As System.Object, _
      ByVal e As System.Windows.Forms.MouseEventArgs) _
      Handles MyBase.MouseMove
      If shouldPaint Then
         Dim graphic As Graphics = CreateGraphics()
         graphic.FillRectangle _
            (New SolidBrush(Color.BlueViolet), e.X, e.Y, 4, 4)
      End If
   End Sub
   Private Sub FrmPainter_MouseDown(ByVal sender As Object, _
      ByVal e As System.Windows.Forms.MouseEventArgs) _
      Handles MyBase.MouseDown
      shouldPaint = True
   End Sub 
   Private Sub FrmPainter_MouseUp(ByVal sender As Object, _
      ByVal e As System.Windows.Forms.MouseEventArgs) _
      Handles MyBase.MouseUp
      shouldPaint = False
   End Sub
End Class