Update 07082021

WebFormApp/Account/AddPhoneNumber.aspx.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+using Microsoft.AspNet.Identity;
+using Microsoft.AspNet.Identity.Owin;
+using System.Threading.Tasks;
+using WebFormApp.Models;
+
+namespace WebFormApp.Account
+{
+    public partial class AddPhoneNumber : System.Web.UI.Page
+    {
+        protected void PhoneNumber_Click(object sender, EventArgs e)
+        {
+            var manager = Context.GetOwinContext().GetUserManager<ApplicationUserManager>();
+            var code = manager.GenerateChangePhoneNumberToken(User.Identity.GetUserId(), PhoneNumber.Text);
+            if (manager.SmsService != null)
+            {
+                var message = new IdentityMessage
+                {
+                    Destination = PhoneNumber.Text,
+                    Body = "Ihr Sicherheitscode lautet " + code
+                };
+
+                manager.SmsService.Send(message);
+            }
+
+            Response.Redirect("/Account/VerifyPhoneNumber?PhoneNumber=" + HttpUtility.UrlEncode(PhoneNumber.Text));
+        }
+    }
+}