private bool IsValid()
{
bool result = true;
#region Nature Code 唔可以吉
errorProvider.SetError(txtNatureCode, string.Empty);
if (txtNatureCode.Text.Length == 0)
{
errorProvider.SetError(txtNatureCode, "Cannot be blank!");
return(false);
}
#endregion
#region 新增，要 check Nature Code 係咪 in use
errorProvider.SetError(txtNatureCode, string.Empty);
if (_NatureId == System.Guid.Empty && ProductNatureEx.IsNatureCodeInUse(txtNatureCode.Text.Trim()))
{
errorProvider.SetError(txtNatureCode, "Nature Code in use");
return(false);
}
#endregion
return(result);
}