Imporsonation using Asp.net mvc 5 Identity

Impersonate.cs

[Authorize(Roles = "Administrator")]
public ActionResult Impersonate(string email)
{
    var impersonatedUser = UserManager.FindByEmail(email);
    var impersonatedIdentity = UserManager.CreateIdentity(impersonatedUser, DefaultAuthenticationTypes.ApplicationCookie);

    AuthenticationManager.SignOut(DefaultAuthenticationTypes.ApplicationCookie);
    AuthenticationManager.SignIn(new AuthenticationProperties { IsPersistent = false }, impersonatedIdentity);

    return RedirectToAction("Index", "Home");
}