LSTANCZYK

public sealed class PropertiesMustMatchAttribute : ValidationAttribute
    {
        private const string _defaultErrorMessage = "'{0}' and '{1}' do not match.";
        private readonly object _typeId = new object();
 
        public PropertiesMustMatchAttribute(string originalProperty, string confirmProperty)
            : base(_defaultErrorMessage)
        {
            OriginalProperty = originalProperty;
            ConfirmProperty = confirmProperty;

LSTANCZYK

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public sealed class NotEqualToAttribute : ValidationAttribute
{
    private const string DefaultErrorMessage = "{0} cannot be the same as {1}.";

    public string OtherProperty { get; private set; }

    public NotEqualToAttribute(string otherProperty)
        : base(DefaultErrorMessage)
    {

LSTANCZYK

/// <summary>    
/// Limit numbers of items in ContentArea
/// Add [MaxItemCount(2)] to a prop-definition limits number of items;
///   [Display(Name = "Articles")]
///   [MaxItemCount(2)]
///   public virtual ContentArea ArticlesContentArea { get; set; }
/// </summary>  
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
public sealed class MaxItemCount : ValidationAttribute
{

LSTANCZYK

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true)]
public class AtLeastOneTrueAttribute : ValidationAttribute
{
    private readonly string _targetProperty;

    public AtLeastOneTrueAttribute(string targetProperty)
    {
        _targetProperty = targetProperty;
    }

LSTANCZYK

using System;
using System.ComponentModel.DataAnnotations;
using System.Linq;


sealed public class UsStateTwoCharacterAbbreviationAttribute : ValidationAttribute
{

	private readonly string[] validStateAbbr = new string[] { "AK", "AL", "AR", "AZ", "CA", "CO", "CT", "DC", "DE", "FL", "GA", "HI", "IA", "ID", "IL", "IN", "KS", "KY", "LA", "MA", "MD", "ME", "MI", "MN", "MO", "MS", "MT", "NC", "ND", "NE", "NH", "NJ", "NM", "NV", "NY", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VA", "VT", "WA", "WI", "WV", "WY" };

LSTANCZYK

public sealed class ValidatePasswordLengthAttribute : ValidationAttribute
    {
        private const string _defaultErrorMessage = "'{0}' must be at least {1} characters long.";
        private readonly int _minCharacters = Membership.Provider.MinRequiredPasswordLength;
 
        public ValidatePasswordLengthAttribute()
            : base(_defaultErrorMessage)
        {
        }
 

LSTANCZYK

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
using System.Text.RegularExpressions;

namespace MvcMovie.Service.AppService
{
  public class ImageType : ValidationAttribute

LSTANCZYK

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public class RequireNonDefaultAttribute : ValidationAttribute
{
    public RequireNonDefaultAttribute()
        : base("The {0} field requires a non-default value.")
    {
    }

    /// <summary>
    /// Override of <see cref="ValidationAttribute.IsValid(object)"/>

LSTANCZYK

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public class AllowedFileExtensionsAttribute : ValidationAttribute
    {
        private List<string> AllowedExtensions { get; set; }

        public AllowedFileExtensionsAttribute(string fileExtensions)
        {
            AllowedExtensions = fileExtensions.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries).ToList();
        }

LSTANCZYK

namespace App.Infrastructure
{
    public class FileMaxSizeAttribute : ValidationAttribute
    {
        public FileMaxSizeAttribute(int maxSize = 10 * 1024 * 1024, string errorMessage = "{0} is not a valid file.")
            : base(errorMessage)
        {
            // 10 MB by default //
            this._maxSize = maxSize;
        }