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using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Data.OleDb;
using System.Web.Services;
 

/// <summary>
/// Summary description for clsWebServices
/// </summary>
 
public class clsWebServices : System.Web.Services.WebService {
 
    public clsWebServices () {
 
        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }
    public class Service1 : System.Web.Services.WebService
    {
        [WebMethod]  
        public dsAddress FindAddress(string LastName, string Path)
        {
            
            
            string connectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=" + Path;
            string commandText = "select * from tblAddressBook where LastName like '" + LastName + "'";
 
            dsAddress DS = default(dsAddress);
 
            using (var connection = new OleDbConnection(connectionString))
            using (var command = new OleDbCommand(commandText, connection))
            {
                // OleDbCommand uses positional, rather than named, parameters.
                // The parameter name doesn't matter; only the position.
                DS = new dsAddress();
                var adapter = new OleDbDataAdapter(command);
                adapter.Fill(DS);
            }
 
            // Add your comments here
            return DS;
 
        }
        
    }
    
    
}
 

<%@ WebService Language="C#" CodeBehind="~/App_Code/clsWebServices.cs" Class="clsWebServices" %>

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="frmAddressBook.aspx.cs" Inherits="frmAddressBook" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server" action="clsWebServices.asmx" method="post">
    <div>
    
        <asp:Label ID="Label1" runat="server" Text="Find Last Name: "></asp:Label>
        <asp:TextBox ID="txtFindLastName" runat="server"></asp:TextBox>
        <asp:Button ID="btnFindLastName" runat="server" Text="Search Now" 
            onclick="btnFindLastName_Click" />
        <br />
        <br />
        <br />
       
        <asp:Label 
             ID="lblMessage" runat="server" 
             Text="Search Result (first record to match)" Font-Size="XX-Large"></asp:Label>
         <br />
            <br />
            <asp:Label ID="Label2" runat="server" Text="First Name: "></asp:Label>
             
         <asp:TextBox ID="txtFirstName" runat="server" BackColor="#FFFFCC"></asp:TextBox>
         <br />
         <br />
         <asp:Label ID="Label3" runat="server" Text="Last Name: "></asp:Label>
     
         <asp:TextBox ID="txtLastName" runat="server" BackColor="#FFFFCC"></asp:TextBox>
         <br />
         <br />
         <asp:Label ID="Label4" runat="server" Text="Email: "></asp:Label>
            
         <asp:TextBox ID="txtEmail" runat="server" BackColor="#FFFFCC"></asp:TextBox>
         <br />
         <br />
         <asp:Label ID="Label5" runat="server" Text="Phone Number: "></asp:Label>
         <asp:TextBox ID="txtPhoneNumber" runat="server" BackColor="#FFFFCC"></asp:TextBox>
        </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
public partial class frmAddressBook : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
 
    protected void btnFindLastName_Click(object sender, EventArgs e)
    {
        lblMessage.Text = "";
        try
        {
            clsWebServices serviceObj = new clsWebServices();
            dsAddress dsFindLastName = new dsAddress();
            string TempPath = Server.MapPath("~/App_Data/AddressBook.mdb");
 
            dsFindLastName = serviceObj.FindAddress(txtFindLastName.Text, TempPath);
 
            if (dsFindLastName.tblAddressBook.Rows.Count > 0)
            {
                DataRow r = dsFindLastName.tblAddressBook.Rows[0];
                txtFirstName.Text = r["FirstName"].ToString();
                txtLastName.Text = r["LastName"].ToString();
                txtEmail.Text = r["Email"].ToString();
                txtPhoneNumber.Text = r["PhoneNumber"].ToString();
            }
            else lblMessage.Text = "No records found!";
        }
        catch (Exception ex)
        {
            lblMessage.Text = ex.Message;
        }
    }
}

This web service is using http://tempuri.org/ as its default namespace.
Recommendation: Change the default namespace before the XML Web service is made public.

[WebService(Namespace="http://microsoft.com/webservices/")]
public class MyWebService {
    // implementation
}