using System;
using FluentValidation;
using FluentValidation.Validators;

namespace FluentValidationSample.Models
{
    public class LowerThanValidator : PropertyValidator
    {
        public string DependentProperty { get; set; }

        public LowerThanValidator(string dependentProperty) : base($"باید کمتر از {dependentProperty} باشد")
        {
            DependentProperty = dependentProperty;
        }

        protected override bool IsValid(PropertyValidatorContext context)
        {
            if (context.PropertyValue == null)
            {
                return false;
            }

            var typeInfo = context.Instance.GetType();
            var dependentPropertyValue =
                Convert.ToInt32(typeInfo.GetProperty(DependentProperty).GetValue(context.Instance, null));

            return int.Parse(context.PropertyValue.ToString()) < dependentPropertyValue;
        }
    }

    public static class CustomFluentValidationExtensions
    {
        public static IRuleBuilderOptions<T, int> LowerThan<T>(
            this IRuleBuilder<T, int> ruleBuilder, string dependentProperty)
        {
            return ruleBuilder.SetValidator(new LowerThanValidator(dependentProperty));
        }
    }
}

using FluentValidation;
using FluentValidation.AspNetCore;
using FluentValidation.Internal;
using FluentValidation.Resources;
using FluentValidation.Validators;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;

namespace FluentValidationSample.Models
{
    public class LowerThanClientValidator : ClientValidatorBase
    {
        private LowerThanValidator LowerThanValidator
        {
            get { return (LowerThanValidator)Validator; }
        }

        public LowerThanClientValidator(PropertyRule rule, IPropertyValidator validator) :
            base(rule, validator)
        {
        }

        public override void AddValidation(ClientModelValidationContext context)
        {
            MergeAttribute(context.Attributes, "data-val", "true");
            MergeAttribute(context.Attributes, "data-val-LowerThan", GetErrorMessage(context));
            MergeAttribute(context.Attributes, "data-val-LowerThan-dependentproperty", LowerThanValidator.DependentProperty);
        }

        private string GetErrorMessage(ClientModelValidationContext context)
        {
            var formatter = ValidatorOptions.MessageFormatterFactory().AppendPropertyName(Rule.GetDisplayName());
            string messageTemplate;
            try
            {
                messageTemplate = Validator.Options.ErrorMessageSource.GetString(null);
            }
            catch (FluentValidationMessageFormatException)
            {
                messageTemplate = ValidatorOptions.LanguageManager.GetStringForValidator<NotEmptyValidator>();
            }
            return formatter.BuildMessage(messageTemplate);
        }
    }
}

<input dir="rtl" type="number"
 data-val="true"
 data-val-lowerthan="باید کمتر از Age باشد"
 data-val-lowerthan-dependentproperty="Age"
 data-val-required="'سابقه کار' must not be empty."
 id="Experience"
 name="Experience"
 value="">

    public class UserModel
    {
        [Display(Name = "نام کاربری")]
        public string Username { get; set; }

        [Display(Name = "سن")]
        public int Age { get; set; }

        [Display(Name = "سابقه کار")]
        public int Experience { get; set; }
    }

    public class UserValidator : AbstractValidator<UserModel>
    {
        public UserValidator()
        {
            RuleFor(x => x.Username).NotNull();
            RuleFor(x => x.Age).NotNull();
            RuleFor(x => x.Experience).LowerThan(nameof(UserModel.Age)).NotNull();
        }
    }

namespace FluentValidationSample.Web
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews().AddFluentValidation(
                fv =>
                {
                    fv.RegisterValidatorsFromAssembly(Assembly.GetExecutingAssembly());
                    fv.RegisterValidatorsFromAssemblyContaining<RegisterModelValidator>();
                    fv.RunDefaultMvcValidationAfterFluentValidationExecutes = false;

                    fv.ConfigureClientsideValidation(clientSideValidation =>
                    {
                        clientSideValidation.Add(
                            validatorType: typeof(LowerThanValidator),
                            factory: (context, rule, validator) => new LowerThanClientValidator(rule, validator));
                    });
                }
            );
        }

<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>

$.validator.unobtrusive.adapters.add('LowerThan', ['dependentproperty'], function (options) {
    options.rules['LowerThan'] = {
        dependentproperty: options.params['dependentproperty']
    };
    options.messages['LowerThan'] = options.message;
});

$.validator.addMethod('LowerThan', function (value, element, parameters) {      
    var dependentProperty = '#' + parameters['dependentproperty'];
    var dependentControl = $(dependentProperty);
    if (dependentControl) {
        var targetvalue = dependentControl.val();
        if (parseInt(targetvalue) > parseInt(value)) {
            return true;
        }
        return false;
    }
    return true;
});

@using FluentValidationSample.Models
@model UserModel
@{
    ViewData["Title"] = "Home Page";
}
<div dir="rtl">
    <form asp-controller="Home"
          asp-action="RegisterUser"
          method="post">
        <fieldset class="form-group">
        <legend>ثبت نام</legend>
            <div class="form-group row">
                <label asp-for="Username" class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10">
                    <input dir="rtl" asp-for="Username" class="form-control" />
                    <span asp-validation-for="Username" class="text-danger"></span>
                </div>
            </div>
            <div class="form-group row">
                <label asp-for="Age" class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10">
                    <input dir="rtl" asp-for="Age" class="form-control" />
                    <span asp-validation-for="Age" class="text-danger"></span>
                </div>
            </div>
            <div class="form-group row">
                <label asp-for="Experience" class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10">
                    <input dir="rtl" asp-for="Experience" class="form-control" />
                    <span asp-validation-for="Experience" class="text-danger"></span>
                </div>
            </div>

            <div class="form-group row">
                <label class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10 text-md-right">
                    <button type="submit" class="btn btn-info col-md-2">ارسال</button>
                </div>
            </div>
        </fieldset>
    </form>
</div>

<body>
   <component type="typeof(App)" render-mode="ServerPrerendered" />

<body>
    <component type="typeof(App)" render-mode="ServerPrerendered" />

    <div id="blazor-error-ui">
        <environment include="Staging,Production">
            An error has occurred. This application may no longer respond until reloaded.
        </environment>
        <environment include="Development">
            An unhandled exception has occurred. See browser dev tools for details.
        </environment>
        <a href="" class="reload">Reload</a>
        <a class="dismiss">🗙</a>
    </div>

    <script src="_framework/blazor.server.js"></script>
</body>

<Router AppAssembly="@typeof(Program).Assembly" PreferExactMatches="@true">
    <Found Context="routeData">
        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
    </Found>
    <NotFound>
        <LayoutView Layout="@typeof(MainLayout)">
            <p>Sorry, there's nothing at this address.</p>
        </LayoutView>
    </NotFound>
</Router>

public void ConfigureServices(IServiceCollection services)
{
    services.AddRazorPages();
    services.AddServerSideBlazor();
    services.AddSingleton<WeatherForecastService>();
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // ...

    app.UseEndpoints(endpoints =>
    {
       endpoints.MapBlazorHub();
       endpoints.MapFallbackToPage("/_Host");
    });
}

namespace BlazorWasmSample
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            builder.RootComponents.Add<App>("#app");

            builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

            await builder.Build().RunAsync();
        }
    }
}

<body>
    <div id="app">Loading...</div>

    <div id="blazor-error-ui">
        An unhandled error has occurred.
        <a href="" class="reload">Reload</a>
        <a class="dismiss">🗙</a>
    </div>
    <script src="_framework/blazor.webassembly.js"></script>
</body>

HTTP Error 500.50 - URL Rewrite Module Error.
The expression "{C:1}://www.{C:2}" cannot be expanded.

HTTP Error 500.19 - Internal Server Error
Error Code 0x8007000d

<head>
    <style>
        img {
          width: 100px;
          display: block;
        }
      </style>
</head>

<body>
    <header class="clearfix" style="height: 50vh; background: url(images/background.jpg) no-repeat center center; background-size: cover; margin-bottom: 20px;">
        <div class="container">
            <img src="images/wisdompetlogo.svg" alt="Wisdom Pet Logo">
        </div>
    </header>

    <div class="container">
        <section id="services">
            <div class="row">
                <article class="col">
                    <img class="mx-auto" src="images/icon-exoticpets.svg" alt="Icon">
                    <h3>Exotic Pets</h3>
                    <p>We offer specialized care for reptiles, rodents, birds,
                        and other exotic pets.</p>
                </article>

                <article class="col">
                    <img class="mx-auto" src="images/icon-grooming.svg" alt="Icon">
                    <h3>Grooming</h3>
                    <p>Our therapeutic grooming treatments help battle fleas,
                        allergic dermatitis, and other challenging skin
                        conditions.</p>
                </article>

                <article class="col">
                    <img class="mx-auto" src="images/icon-health.svg" alt="Icon">
                    <h3>General Health</h3>
                    <p>Wellness and senior exams, ultrasound, x-ray, and dental
                        cleanings are just a few of our general health
                        services.</p>
                </article>

                <article class="col">
                    <img class="mx-auto" src="images/icon-nutrition.svg" alt="Icon">
                    <h3>Nutrition</h3>
                    <p>Let our nutrition experts review your pet's diet and
                        prescribe a custom nutrition plan for optimum health
                        and disease prevention.</p>
                </article>

                <article class="col">
                    <img class="mx-auto" src="images/icon-pestcontrol.svg" alt="Icon">
                    <h3>Pest Control</h3>
                    <p>We offer the latest advances in safe and effective
                        prevention and treatment of fleas, ticks, worms, heart
                        worm, and other parasites.</p>
                </article>

                <article class="col">
                    <img class="mx-auto" src="images/icon-vaccinations.svg" alt="Icon">
                    <h3>Vaccinations</h3>
                    <p>Our veterinarians are experienced in modern vaccination
                        protocols that prevent many of the deadliest diseases
                        in pets.</p>
                </article>
            </div>
        </section>
    </div>
</body>

<div class="container">

    <div class="container">
        <section id="services">
            <div class="row">
                <article class="col">

<head>
    <style>
        img {
              width: 100%;
              height: 200px;
              max-height: 200px;
            }
    </style>
</head>

<body>
    <div class="container">
        <div id="services">
            <div class="row">
                <section class="col">
                    <img src="images/image.png" alt="sample image">
                    <h4>Exotic Pets</h4>
                    <p>We offer <strong>specialized</strong> care for <em>reptiles,
                            rodents, birds,</em> and other exotic pets.</p>
                </section>
                <section class="col">
                    <img src="images/image.png" alt="sample image">
                    <h4>Grooming</h4>
                    <p>Our therapeutic <span class="font-weight-bold">grooming</span>
                        treatments help battle fleas, allergic dermatitis, and
                        other challenging skin conditions.</p>
                </section>
                <section class="col">
                    <img src="images/image.png" alt="sample image">
                    <h4>General Health</h4>
                    <p>Wellness and senior exams, ultrasound, x-ray, and dental
                        cleanings are just a few of our general health
                        services.</p>
                </section>
                <section class="col">
                    <img class="img-fluid" src="images/image.png" alt="sample image">
                    <h4>Nutrition</h4>
                    <p>Let our nutrition experts review your pet's diet and
                        prescribe a custom nutrition plan for optimum health
                        and
                        disease prevention.</p>
                </section>
                <section class="col">
                    <img src="images/image.png" alt="sample image">
                    <h4>Pest Control</h4>
                    <p>We offer the latest advances in safe and effective
                        prevention and treatment of fleas, ticks, worms, heart
                        worm, and other parasites.</p>
                </section>
                <section class="col">
                    <img src="images/image.png" alt="sample image">
                    <h4>Vaccinations</h4>
                    <p>Our veterinarians are experienced in modern vaccination
                        protocols that prevent many of the deadliest diseases
                        in
                        pets.</p>
                </section>
            </div>
        </div>
    </div>
</body>

    <div class="container">
        <div id="services">
            <div class="row">
                <section class="col-6">

<section class="col-sm">

<section class="col-sm-6">

<section class="col-sm-6 col-md-4">

<section class="col-sm-6 col-md-4 offset-sm-1">