CustomValidation not working on asp.net mvc form?

Question

Hi Team

 

I  need some help, my customValidation does not work and when i debug its showing any error. Please assist mates, basically the logic i want when leaving the [email protected](). Must validate message error "This field is required".

 

// Model class
[Required(ErrorMessage = "This field is required")]

        [DataType(DataType.PhoneNumber)]

        public string CellNumber { get; set; }


// CustomValidation.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using eNtsaRegistrationTraining.Models;
using System.ComponentModel.DataAnnotations;

namespace eNtsaRegistrationTraining.CustomValidation
{
    public class CustomFormValidation:ValidationAttribute
    {
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var registration = (TrainingRegForm)validationContext.ObjectInstance;
            if(registration.CellNumber==null)
            {
                return new ValidationResult("This field is required");
            }

            return base.IsValid(value, validationContext);
        }
    }
}

// Controller.
    //GET:TrainingRegForm/Create/WebRequest.
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult SubmitRegDetails([Bind(Include= "Id, Title, FirstName, LastName, Position, Company, StreetAddress, StreetAddressLine, City, StateProvince, ZipCode,Email, CellNumber, DietaryRequirement")]TrainingRegForm eNtsaTraining)
        {
            if(ModelState.IsValid)
            {
                eNtsaTraining.Id = Guid.NewGuid();
                db.TrainingRegs.Add(eNtsaTraining);
                db.SaveChanges();
                return RedirectToAction("SaveRegForm");
            }

            // Validates when empty.
            if(ModelState.IsValid)
            {
                return RedirectToAction("SaveRegForm");
            }
            return View(eNtsaTraining);
        }

// View
div class="form-group row">
                            <label for="Attendee" class="col-sm-2 col-form-label">Attendee Cell Number*</label>
                            <div class="col-sm-3">
                                @Html.EditorFor(model => model.RegForm.CellNumber, new { htmlAttributes = new { @class = "form-control", autofocus = "autofocus", placeholder = "Cell Number" } })
                                @Html.ValidationMessageFor(model => model.RegForm.CellNumber, "", new { @class = "text-danger" })
                            </div>
                        </div>