public ActionResult Login(string username, string password)
{
var user = _userManager.Find(username, password);
if (user == null)
{
return(HttpNotFound());
}
// success
var ident = _userManager.CreateIdentity(user, DefaultAuthenticationTypes.ApplicationCookie);
//use the instance that has been created.
var authManager = HttpContext.GetOwinContext().Authentication;
authManager.SignIn(
new AuthenticationProperties {
IsPersistent = false
}, ident);
return(Redirect("/Home"));
}