C#

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

//sql client import

using System.Data.SqlClient;
using System.Data;

using System.Data.OleDb;

namespace WebService1
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    //[WebService(Namespace = "http://tempuri.org/")]
    //[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    //[System.ComponentModel.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 Service1 : System.Web.Services.WebService
    {

        

        
        

        [WebMethod]
        public DataTable getData()
        {
            OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\MemberSites\\MemberSites_AspSpider_Info\\akosiDAN\\database\\Database1.mdb");
            DataSet ds = new DataSet();
            DataTable dt = new DataTable();
            ds.Tables.Add(dt);

            OleDbDataAdapter da = new OleDbDataAdapter ("Select * from phonebooktable",con);
            da.Fill (dt);

            return dt;
        }

        [WebMethod]
        public DataTable getData()
        {
            SqlConnection con = new SqlConnection("server= DANDAN-PC\\SQLEXPRESS;uid=MYID;pwd=MYPASSWORD;database=phonebookdatabase");
            DataSet ds = new DataSet();
            DataTable dt = new DataTable();
            ds.Tables.Add(dt);

            SqlDataAdapter da = new SqlDataAdapter("Select * from phonebooktable", con);

            da.Fill(dt);

            return dt;
        }
    }
}