public async Task<ActionResult> Delete(string id)
        {
            ApplicationUser user = await userManager.FindByIdAsync(id);

            if (user != null)
            {
                IdentityResult result = await userManager.DeleteAsync(user);

                if (result.Succeeded)
                {
                    return RedirectToAction("Index");
                }
                else
                {
                    TempData["Error"] = "Error!";
                    return RedirectToAction("Index");
                }
            }

            TempData["Error"] = "Error!";
            return RedirectToAction("Index");
        }