Problem with image in WPF.

 Public Sub picshow()
        Using cmd As New SqlCommand("Select * From Staff where StaffID='" & txtAA.Text & "'", GlobalClass.con)
            Using dr As SqlDataReader = cmd.ExecuteReader()
                Using dt As New DataTable
                    dt.Load(dr)
                    Try
                        Dim row As DataRow = dt.Rows(0)
                        Using ms As New MemoryStream(CType(row("Photo"), Byte()))
                            Dim img As Image = Image.FromStream(ms)
                            PictBox.Image = img '<-- Here is the problem "with Image"
                        End Using
                    Catch ex As Exception
                        GoTo err
                    End Try
                    Exit Sub
                End Using
            End Using
        End Using
        GlobalClass.con.Close()
err:
    End Sub