Bennedik.Validation.Integration.WPF.ErrorProvider.Validate C# (CSharp) Method

        public bool Validate()
        {
            bool isValid = true;
            _firstInvalidElement = null;
            errorMessages = new List<string>();

            FindBindingsRecursively(Parent,
                delegate(FrameworkElement element, Binding binding, DependencyProperty dp)
                {
                    foreach (ValidationRule rule in binding.ValidationRules)
                    {
                        System.Windows.Controls.ValidationResult valid = rule.Validate(element.GetValue(dp), CultureInfo.CurrentUICulture);
                        if (!valid.IsValid)
                        {
                            if (isValid)
                            {
                                isValid = false;
                                _firstInvalidElement = element;
                            }

                            BindingExpression expression = element.GetBindingExpression(dp);
                            ValidationError error = new ValidationError(rule, expression, valid.ErrorContent, null);
                            System.Windows.Controls.Validation.MarkInvalid(expression, error);

                            string errorMessage = valid.ErrorContent.ToString();
                            if (!errorMessages.Contains(errorMessage))
                                errorMessages.Add(errorMessage);
                        }
                    }
                });

            return isValid;
        }