Удалить нарисованный текст с Picturebox

 Dim StringToDraw As String = "Кликните на меня."
        Dim MyBrush As New SolidBrush(Color.Tomato)
        Dim StringFont As New Font("Arial", 22)
        Dim PixelsAcross As Integer = 40
        Dim PixelsDown As Integer = 30
        e.Graphics.DrawString(StringToDraw, StringFont, MyBrush, PixelsAcross, PixelsDown)
        Dim MyBrush1 As New SolidBrush(Color.Black)
        e.Graphics.DrawString(StringToDraw, StringFont, MyBrush1, PixelsAcross + 1.5, PixelsDown + 1.5)

    Dim Draw As Boolean
 
    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        If Draw = True Then
            Dim StringToDraw As String = "Кликните на меня."
            Dim MyBrush As New SolidBrush(Color.Tomato)
            Dim StringFont As New Font("Arial", 22)
            Dim PixelsAcross As Integer = 40
            Dim PixelsDown As Integer = 30
            e.Graphics.DrawString(StringToDraw, StringFont, MyBrush, PixelsAcross, PixelsDown)
            Dim MyBrush1 As New SolidBrush(Color.Black)
            e.Graphics.DrawString(StringToDraw, StringFont, MyBrush1, PixelsAcross + 1.5, PixelsDown + 1.5)
        Else
            e.Graphics.Clear(Me.BackColor)
        End If
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Draw = Not Draw
        Me.Refresh()
    End Sub