public class ApplicationUser : IdentityUser
    {
        public string Name { get; set; }
        public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
        {
            var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
            userIdentity.AddClaim(new Claim("Name", Name));
            return userIdentity;
        }
    }

        [HttpPost]
        [ValidateAntiForgeryToken]
        [Authorize(Roles = "admin")]
        public async Task<ActionResult> EditAccount(ApplicationUser user, string[] selectedRoles)
        {
            try
            {
                if (user == null)
                    return HttpNotFound("Пользователь не найден");
               
                var selectedUser = await UserManager.FindByIdAsync(user.Id);
                if (selectedUser == null)
                    return HttpNotFound("Пользователь не найден");
            
                selectedUser.Email = user.Email;
                selectedUser.Name = user.Name;
                await UserManager.RemoveFromRolesAsync(selectedUser.Id, UserManager.GetRolesList().Select(s => s.Name).ToArray());
                await UserManager.AddToRolesAsync(selectedUser.Id, selectedRoles);
                await UserManager.UpdateAsync(selectedUser);
                
                TempData["StatusMessage"] = "Данные успешно обновлены";
            }
            catch {
                TempData["StatusMessage"] = "Что-то пошло не так, возникла ошибка при обновлении";}

            return RedirectToAction("AccountsList");
        }

Session.Clear();
Session.Abandon();
Response.Cookies["ASP.NET_SessionId"].Value = string.Empty;
Response.Cookies["ASP.NET_SessionId"].Expires = DateTime.Now.AddMonths(-10);

        [HttpPost]
        [ValidateAntiForgeryToken]
        [Authorize(Roles = "admin")]
        public async Task<ActionResult> EditAccount(ApplicationUser user, string[] selectedRoles)
        {
            try
            {
                if (user == null)
                    return HttpNotFound("Пользователь не найден");
               
                var selectedUser = await UserManager.FindByIdAsync(user.Id);
                if (selectedUser == null)
                    return HttpNotFound("Пользователь не найден");
            
                selectedUser.Email = user.Email;
                selectedUser.Name = user.Name;
                await UserManager.RemoveFromRolesAsync(selectedUser.Id, UserManager.GetRolesList().Select(s => s.Name).ToArray());
                await UserManager.AddToRolesAsync(selectedUser.Id, selectedRoles);
                await UserManager.UpdateAsync(selectedUser);
                Session.Clear();
                Session.Abandon();
Response.Cookies["ASP.NET_SessionId"].Value = string.Empty;
Response.Cookies["ASP.NET_SessionId"].Expires = DateTime.Now.AddMonths(-10);
                TempData["StatusMessage"] = "Данные успешно обновлены";
            }
            catch {
                TempData["StatusMessage"] = "Что-то пошло не так, возникла ошибка при обновлении";}

            return RedirectToAction("AccountsList");
        }

  [Authorize(Roles = "admin")]
        public async Task<ActionResult> AccountsList()
        {
            Session.Clear();
            Session.Abandon();
            Response.Cookies["ASP.NET_SessionId"].Value = string.Empty;
            Response.Cookies["ASP.NET_SessionId"].Expires = DateTime.Now.AddMonths(-10);
            return View(await UserManager.Users.ToListAsync());
        }

        [HttpGet]
        [Authorize(Roles = "admin")]
        public async Task<ActionResult> AccountsList()
        {
            Session.Clear();
            Session.Abandon();
            Response.Cookies["ASP.NET_SessionId"].Value = string.Empty;
            Response.Cookies["ASP.NET_SessionId"].Expires = DateTime.Now.AddMonths(-10);
            return View(await UserManager.Users.ToListAsync());
        }

 [Authorize(Roles = "admin")]

@if (User.IsInRole("admin"))
                {
                    <li class="nav-item">@Html.ActionLink("Список пользователей сайта", "AccountsList", "Manage", null, new { @class = "nav-link" })</li>
                }