Xamarin VS 2022 problem

In Xamarin, especially for Android development, the usage of System.Web.Services and System.Web.Services.Protocols is not supported. These namespaces are typically used in traditional .NET web applications and not in the context of mobile applications.
For making web service calls in Xamarin Android, you should use the System.Net namespace or libraries like HttpClient or HttpWebRequest for sending and receiving data from web services or APIs.
Here's an example of how you can make a simple HTTP request using HttpClient in Xamarin Android:

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Android.App;
using Android.Widget;
using Android.OS;

namespace YourNamespace
{
    [Activity(Label = "YourApp", MainLauncher = true)]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            // Call the web service
            CallWebService();
        }

        private async void CallWebService()
        {
            using (HttpClient client = new HttpClient())
            {
                try
                {
                    HttpResponseMessage response = await client.GetAsync("https://api.example.com/data");
                    response.EnsureSuccessStatusCode();
                    string responseBody = await response.Content.ReadAsStringAsync();

                    // Do something with the response
                    Console.WriteLine(responseBody);
                }
                catch (HttpRequestException e)
                {
                    Console.WriteLine("Error: " + e.Message);
                }
            }
        }
    }
}

Make sure, you have the appropriate permissions in your AndroidManifest.xml file to allow internet access if you are making network requests. Make sure the required NuGet packages are installed as well.

Hope this will help you. Happy Coding!!!