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        public bool IsValid
        {
            get
            {
                return !string.IsNullOrWhiteSpace(CompanyName) &&
                        !string.IsNullOrWhiteSpace(InvoiceName) &&
                        !string.IsNullOrWhiteSpace(Charge) &&
                        !string.IsNullOrWhiteSpace(Street) &&
                        !string.IsNullOrWhiteSpace(Postale) &&
                        !string.IsNullOrWhiteSpace(City) &&
                        DocumentPath.HasValue;
            }
        }