[c#] How to create roles in ASP.NET Core and assign them to users?

Update in 2020. Here is another way if you prefer.

 IdentityResult res = new IdentityResult();
 var _role = new IdentityRole();
 _role.Name = role.RoleName;
  res = await _roleManager.CreateAsync(_role);
  if (!res.Succeeded)
  {
        foreach (IdentityError er in res.Errors)
        {
             ModelState.AddModelError(string.Empty, er.Description);
         }
         ViewBag.UserMessage = "Error Adding Role";
         return View();
  }
  else
  {
        ViewBag.UserMessage = "Role Added";
        return View();
   }

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