System.ComponentModel.DataAnnotations.EqualToAttribute.IsValid C# (CSharp) Method

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var memberNames = new[] { validationContext.MemberName };

            PropertyInfo otherPropertyInfo = validationContext.ObjectType.GetProperty(OtherProperty);
            if (otherPropertyInfo == null)
            {
                return new ValidationResult(CultureInfo.CurrentCulture.Format("Could not find a property named {0}.", OtherProperty), memberNames);
            }

            var displayAttribute =
                otherPropertyInfo.GetCustomAttributes(typeof(DisplayAttribute), false).FirstOrDefault() as DisplayAttribute;

            if (displayAttribute != null && !string.IsNullOrWhiteSpace(displayAttribute.Name))
            {
                OtherPropertyDisplayName = displayAttribute.Name;
            }

            object otherPropertyValue = otherPropertyInfo.GetValue(validationContext.ObjectInstance, null);
            if (!Equals(value, otherPropertyValue))
            {
                return new ValidationResult(FormatErrorMessage(validationContext.DisplayName), memberNames);
            }
            return null;
        }