protected void Page_Load(object sender, EventArgs e)
{
var userId = signinHelper.GetVerifiedUserId();
if (userId == null)
{
Response.Redirect("/Account/Error", true);
}
var userFactors = manager.GetValidTwoFactorProviders(userId);
Providers.DataSource = userFactors.Select(x => x).ToList();
Providers.DataBind();
}