public string ValidateIfNullOrEmpty(string field)
{
return((string.IsNullOrWhiteSpace(field) || string.IsNullOrEmpty(field)) ? ValidationErrorMessages.FieldRequired(field) : string.Empty);
}
/// <summary>
/// returns error message if id is default. Otherwise, returns empty string
/// </summary>
/// <param name="id">Guid to be checked</param>
/// <returns></returns>
public string ValidateGuidIfDefault(Guid id)
{
return((id == Guid.Empty) ? ValidationErrorMessages.FieldRequired(id) : string.Empty);
}