// Lay danh sach validators
    private ValidatorCollection GetValidators()
    {
        if (this.validators == null)
        {
            this.validators = ValidationManager.FindValidatorAttributes(this.markType);
        }

        if (this.instValidators != null)
        {
            foreach (KeyValuePair <string, List <Validator> > kvp in this.instValidators)
            {
                this.validators[kvp.Key].AddRange(kvp.Value);
            }
        }

        return(this.validators);
    }