Network authentication of a webservice

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C#

ASP.NET

hi , i tried alot to find a solution regarding network authentication on webservice but cant find any help , basically i want to authenticate a webservice that when some body use it , it require username and pass


Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ZTestFormApp.DataAccessService;
namespace ZTestFormApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void btnAdd_Click(object sender, EventArgs e)
        {
            int x = int.Parse(txtX.Text);
            int y = int.Parse(txtY.Text);
            int result = 0;
            DataAccessService.DataAccessServiceSoapClient c = new DataAccessServiceSoapClient();
            result = c.Add(x, y);
            txtResult.Text = result.ToString();
        }
    }
}

DataAccessService.asmx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;

namespace ZTestWebService
{
    /// <summary>
    /// Summary description for DataAccessService
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    // [System.Web.Script.Services.ScriptService]
    public class DataAccessService : System.Web.Services.WebService
    {

        [WebMethod]
        public int Add(int x, int y)
        {
            return x+y;
        }
    }
}