Attribute-flavored Domain Driven Design

using System;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using Codebasement.DomainDrivenDesign.Basement.Utilities;

namespace Codebasement.DomainDrivenDesign.Model.Validators
{
    internal static class PropertyValidators
    {
        private const string caption = "Codebasement";

        internal static bool ValidateDateTime(string value)
        {
            try
            {
                DateTime.Parse(value);
            }
            catch
            {
                return false;
            }
            return true;
        }

        internal static object ValidateEnum(Type enumeration, string val, object deflt)
        {
            if (val != null && Enum.IsDefined(enumeration, val))
                return Enum.Parse(enumeration, val);
            return deflt;
        }

        internal static bool ValidateStringLength(string value, int min, int max)
        {
            if (value.Length < min ||
                value.Length > max)
            {
                MessageBox.Show(String.Format("Length must be between {0} and {1}.",min,max), 
                    caption,MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }
            return true;
        }

        internal static bool ValidateIPAddress(string value)
        {
            if (String.IsNullOrEmpty(value))
                return true;

            Regex regex = new Regex(RegexExpressions.IPAddressFormat);
            if (!regex.Match(value).Success)
            {
                MessageBox.Show("Not a valid IP address.", 
                    caption, MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }
            return true;
        }
    
    
    }
}