Web Service in ASP.NET

How we can create a basic web service and consume it in asp.net

STEP 1: Create a Web Service in your Visual Studio and code this in Service.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

// 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 Service : System.Web.Services.WebService

{

    public authHeader au;

    public Service()

    {

        //Uncomment the following line if using designed components 

        //InitializeComponent(); 

    }

    [SoapHeader("au", Required = true)]

    [WebMethod]

    public string data()

    {

        if (au.userName == "vijay")

        {

            return "Hello World";

        }

        else

        {

            return "error";

        }

    }

    public class authHeader : SoapHeader

    {

        public string userName = "vijay";

        public string passWord = "Prajapati";

    }

}

STEP 2: Run this web-services and copy the url

STEP 3:Create a new web site in asp.net and add "Add Service Reference " by clicking on "WebSites" in menu bar. When window of Add Service Reference is open click on "Advanced.." at botton of window,then a new window of service reference setting is opened there you find the "Add Web Reference" and by clicking on button Add Web Reference u got the new  window of "Add Web Reference"

STEP 4: When "Add Web Reference" Window open past the url ,that you copy from web services and press the appropriate button and it will added

STEP 5 : Code this in your default.aspx page

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.Services;

using System.ServiceModel;

public partial class _Default : System.Web.UI.Page 

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        localhost.Service  s = new localhost.Service();

        localhost.authHeader a = new localhost.authHeader();

        a.userName ="vijay";

        a.passWord ="prajapati";

        s.authHeaderValue = a;

        Label1.Text = s.data();

    }

}

for more details

url : http://www.aspdotnet-suresh.com/2011/05/aspnet-web-service-or-creating-and.html