VS.net中鼠标读取Picture坐标问题

[shuxiong_2000]

我在用VS.NET的时候遇到一点问题，我在PictureBox控件Image属性里载入图片，并用MouseUp读取当前鼠标在Picture中的坐标。当Image是我预先载入的图片时我的程序没有问题，但是当我把剪贴板的数据用Timer定时截取到Picture.Image的时候MouseUp就不能用了，请各位帮我看一下我的程序该怎么改动。
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If DispHold = False Then
My.Computer.Clipboard.Clear() : SendMessage(ctCapWin, WM_CAP_Edit_Copy, 0, 0)
End If
If My.Computer.Clipboard.ContainsImage() Then
Me.PictureBox3.Image = My.Computer.Clipboard.GetImage()
End If
End Sub

Private Sub PictureBox3_MouseUp(ByVal eventSender As System.Object, ByVal eventArgs As System.Windows.Forms.MouseEventArgs)

Dim X As Single
Dim Y As Integer

X = System.Windows.Forms.Cursor.Position.X.ToString - Location.X
Y = System.Windows.Forms.Cursor.Position.Y.ToString - Location.Y

Label2_0.Location = New Point(X, Y)
Text1.text=X & Y

End Sub

[123工艺品]

System.Windows.Forms.Cursor.Position.X.ToString 这个是转到字符串了