Validate TxtBox For Mobile Number

Private Sub TxtNo_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TxtNo.KeyPress
        If Asc(e.KeyChar) <> 8 Then
            If Asc(e.KeyChar) < 48 Or Asc(e.KeyChar) > 57 Or TxtNo.Text.Length > 9 Then
                e.Handled = True
            End If
        End If
    End Sub