How to check Email Id already exists validation in Asp.net MVC c#?

[HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Register(Account account, string returnUrl)
        {
            var isEmailIdExists = db.Accounts.Any(x => x.Email == account.Email);

            if (isEmailIdExists)
            {
                ModelState.AddModelError("Email", "User with this email already exists.");
                return View(account);
            }

            account.CreatedOn = DateTime.Now;
            account.ModifiedOn = DateTime.Now;
            account.IsDeleted = 0;

            account.Password = HtmlUtility.Encrypt(account.Password);

            if (ModelState.IsValid)
            {
                db.Accounts.Add(account);
                db.SaveChanges();
            }

            return View();
        }

 @using (@Html.BeginForm("register", "user", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { Class = "signin-form" }))
                        {
                            @Html.AntiForgeryToken()

                            <div class="form-group mb-3">
                                <label class="label">User Name</label>
                                @Html.TextBoxFor(model => model.UserName, new { type = "text", required = "required", placeholder = "Enter Username", Class = "form-control" })
                                @Html.ValidationMessageFor(model => model.UserName, "", new { @class = "text-danger" })
                            </div>
                            <div class="form-group mb-3">
                                <label class="label">E-MAIL</label>
                                @Html.TextBoxFor(model => model.Email, new { type = "text", required = "required", placeholder = "Enter Email Address", Class = "form-control" })
                                @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
                            </div>
                            <div class="form-group mb-3">
                                <label class="label">ENTER YOUR PASSWORD</label>
                                @Html.TextBoxFor(model => model.Password, new { type = "password", minlength = "4", required = "required", placeholder = "Password", Class = "form-control" })
                                @Html.ValidationMessageFor(model => model.Password, "", new { @class = "text-danger" })
                            </div>
                            <div class="form-group">
                                <button class="form-control btn btn-primary submit px-3" style="text-transform:uppercase;"><i class="fa fa-sign-in"></i>  Register</button>
                            </div>

                        }