How to validate textbox based on checkbox value

Iam trying to validate textbox based on checkbox value. please view my model class and IsValid override method.

public class Product
{
    //Below property value(HaveExperiance)
    [MustBeProductEntered(HaveExperiance)] 
    public string ProductName { get; set; }

    public bool HaveExperiance { get; set; }
}

public class MustBeTrueAttribute : ValidationAttribute
{
    //Here i need the value of HaveExperiance property which 
    //i passed from  [MustBeProductEntered(HaveExperiance)]  in product class above.
    public override bool IsValid(object value)
    {
        return value is bool && (bool)value;
    }
}

You can see above in ProductName property in product class where iam trying to pass the HaveExperiance class property value, If it checked then user must have to fill the ProductName textbox.

So my orignal question is that how can i validate the ProductName textbox based on the HaveExperiance value, thanks in advance.

EDIT:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;
using System.Linq;
using System.Reflection;
using System.Web;
using System.Web.Mvc;

namespace Mvc.Affiliates.Models
{
    public class MyProducts
    {
        [Key]
        [Required(ErrorMessage = "Please insert product id.")]
        public string ProductId { get; set; }

        [RequiredIf("HaveExperiance")]
        public string ProductName { get; set; }

        public bool HaveExperiance { get; set; }
        public List<MyProducts> prolist { get; set; }
    }

    public class RequiredIfAttribute : ValidationAttribute
    {
        private RequiredAttribute _innerAttribute = new RequiredAttribute();

        public string Property { get; set; }

        public object Value { get; set; }

        public RequiredIfAttribute(string typeProperty)
        {
            Property = typeProperty;
        }

        public RequiredIfAttribute(string typeProperty, object value)
        {
            Property = typeProperty;
            Value = value;
        }

        public override bool IsValid(object value)
        {
            return _innerAttribute.IsValid(value);
        }
    }

    public class RequiredIfValidator : DataAnnotationsModelValidator<RequiredIfAttribute>
    {
        public RequiredIfValidator(ModelMetadata metadata, ControllerContext context, RequiredIfAttribute attribute) : base(metadata, context, attribute) { }

        public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()
        {
            return base.GetClientValidationRules();
        }

        public override IEnumerable<ModelValidationResult> Validate(object container)
        {
            PropertyInfo field = Metadata.ContainerType.GetProperty(Attribute.Property);

            if (field != null)
            {
                var value = field.GetValue(container, null);

                if ((value != null && Attribute.Value == null) || (value != null && value.Equals(Attribute.Value)))
                {
                    if (!Attribute.IsValid(Metadata.Model))
                    {
                        yield return new ModelValidationResult { Message = ErrorMessage };
                    }
                }
            }
        }
    }

Controller

public class HomeController : Controller
    {
        //
        // GET: /Home/

        MvcDbContext _db = new MvcDbContext();
        public ActionResult Index()
        {
          return View();
        }

        [HttpPost]
        public ActionResult Index(MyProducts model)
        {
            string ProductId = model.ProductId;
            string ProductName = model.ProductName;
            //bool remember = model.HaveExperiance;
            return View();
        }
    }

View

@model   Mvc.Affiliates.Models.MyProducts
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Details</h2>
<br />

<div style="height:200px; width:100%">
  @using  (Html.BeginForm("Index","Home", FormMethod.Post))
    {

   <h2>Details</h2>

        @Html.LabelFor(model => model.ProductId)
        @Html.TextBoxFor(model => model.ProductId)

        @Html.LabelFor(model => model.ProductName)
        @Html.EditorFor(model => model.ProductName)
        @Html.ValidationMessageFor(model => model.ProductName, "*")

        @Html.CheckBoxFor(model => model.HaveExperiance)
        @Html.ValidationMessageFor(model => model.HaveExperiance, "*")
       <input type="submit" value="Submit" />
  }

</div>

So far i have tried the above code, Actually i needed when i click on checkbox then it should start validate my ProductName textbox, if uncheck then not. iam missing a little thing in above code, please help and rectify me.