SOAP request to ASMX service

Hello, I am trying to send a SOAP request using a web form, and simply displaying the returned value as a label.  This is my first time using SOAP and I am honestly not sure if I am even going about this the correct way.  The web service is already in place and is a service reference in my web app.  The web service method (getCounterData) pulls a value from the database based on input parameters and returns the value.  The input parameters are:string user, string pwd, int system,Guid (CounterUId).   I am also unsure if the way I am using the Guid is correct (The Guid was sourced from the database table) and I had to remove the hyphens from the Guid for it to work.

Here is what I have so far, I don't know if this is even remotely correct.

Any help would be greatly appreciated!

using System;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        public Guid B744a97bc1524a17ae4e946f83524d2d { get; private set; }

        protected void Page_Load(object send, EventArgs e)


        {

           Abacus.ServiceSystemSoapClient client = new Abacus.ServiceSystemSoapClient();

            client.getCounterData(user: "User", pwd: "Password", system: 0, counterUId: B744a97bc1524a17ae4e946f83524d2d);

            Label1.Text =