اين اجد خاصية Auto Redraw في .NET

Dim b As Bitmap
Dim _autoredraw As Boolean

Public Sub New()
InitializeComponent()
b = New Bitmap(Me.ClientSize.Width, Me.ClientSize.Height)
End Sub

Private Property AutoRedraw As Boolean
Get
Return _autoredraw
End Get
Set(ByVal value As Boolean)
_autoredraw = value
End Set
End Property

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
If _autoredraw Then
Dim g As Graphics = MyBase.CreateGraphics()
g.DrawImage(b, 0, 0)
End If
End Sub

Private Sub Form1_Resize(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Resize
If Me.ClientSize.Width > b.Width And Me.ClientSize.Height > b.Height Then
Dim c As New Bitmap(Me.ClientSize.Width, Me.ClientSize.Height)
Dim g As Graphics = Graphics.FromImage(c)
g.DrawImage(b, 0, 0)
b = c
g.Dispose()
End If
End Sub

Public Shadows Function CreateGraphics() As Graphics
If _autoredraw Then
Return Graphics.FromImage(b)
End If
Return MyBase.CreateGraphics()
End Function
End Class

Public Class Form1