Vb.net 2 Signatures - vb.net

Question

Im quite finished with my program, there are only 2 more things to do. But now lets focus on my main problem: Ive got a code, that gives the user the possibility to draw inside a picturebox, that will work later as a signature. Everything was working fine until I added a second picturebox with the same code( yes I changed for ex. picturebox1 to pixturebox2). As I start drawing I cant let go and both pictureboxes are getting interracted at the same time.
That my code for both pictureboxes.
Private _Previous As System.Nullable(Of Point) = Nothing
Private Sub pictureBox1_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox1.MouseDown
_Previous = e.Location
pictureBox1_MouseMove(sender, e)
End Sub
Private Sub pictureBox1_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox1.MouseMove
If _Previous IsNot Nothing Then
If PictureBox1.Image Is Nothing Then
Dim bmp As New Bitmap(PictureBox1.Width, PictureBox1.Height)
Using g As Graphics = Graphics.FromImage(bmp)
g.Clear(Color.White)
End Using
PictureBox1.Image = bmp
End If
Using g As Graphics = Graphics.FromImage(PictureBox1.Image)
g.DrawLine(Pens.Black, _Previous.Value, e.Location)
End Using
PictureBox1.Invalidate()
_Previous = e.Location
End If
End Sub
Private Sub pictureBox2_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox2.MouseDown
_Previous = e.Location
pictureBox1_MouseMove(sender, e)
End Sub
Private Sub pictureBox2_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox2.MouseMove
If _Previous IsNot Nothing Then
If PictureBox2.Image Is Nothing Then
Dim bmp As New Bitmap(PictureBox2.Width, PictureBox2.Height)
Using g As Graphics = Graphics.FromImage(bmp)
g.Clear(Color.White)
End Using
PictureBox2.Image = bmp
End If
Using g As Graphics = Graphics.FromImage(PictureBox2.Image)
g.DrawLine(Pens.Black, _Previous.Value, e.Location)
End Using
PictureBox2.Invalidate()
_Previous = e.Location
End If
End Sub
Private Sub pictureBox2_MouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) Handles PictureBox2.MouseUp
_Previous = Nothing
End Sub
I know there is an mistake somewere, but Im to excited to see it.

Answer 1

In this event handler for PictureBox2 you call the handler for PictureBox1:
Private Sub pictureBox2_MouseDown(ByVal sender As Object, _
ByVal e As MouseEventArgs) Handles PictureBox2.MouseDown
_Previous = e.Location
pictureBox1_MouseMove(sender, e)
End Sub
I'm guessing changing it to:
pictureBox2_MouseMove(sender, e)
will fix it.