private void cbColor_Validating(object sender, CancelEventArgs e)
 {
     FormControls.ProvideError(e, cbColor, errorProvider);
 }
 private void txtStock_Validating(object sender, CancelEventArgs e)
 {
     FormControls.ProvideError(e, txtStock, errorProvider);
 }
 private void gb_Subtype_Validating(object sender, CancelEventArgs e)
 {
     FormControls.ProvideError(e, gb_Subtype, errorProvider);
 }