Xamarin forms and web-service and soap how to connect?

Question

Android

Good afternoon, please tell me how to access the web service. I wanted to receive data via Soap
. I connected a third-party service and added it to the project.
But the problem is that before that I wrote all the code in the app section. But the service is added only for Android or ios.
Most likely I'm doing something wrong, please tell me in which direction to dig.
Tell me how to do it correctly or tell me the material I will be grateful.
Connection failed in this way.

using (service Ckp_service = new service ())
                {
                    service .SoapVersion = System.Web.Services.Protocols.SoapProtocolVersion.Soap12;
                    service .Credentials = new System.Net.NetworkCredential(comboBox1.Text, maskedTextBox1.Text);
 
      
                }

Answer 1

Here is an example of sending data: https://youtu.be/MGAMfBW0TI4