using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;



/// 

/// Summary description for AsynWebService
/// 

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class AsynWebService : System.Web.Services.WebService {

    public AsynWebService () {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [WebMethod]
    public string HelloWorld() {
        return "Hello World";
    }

    [WebMethod]
    public string AsynCallWait(int sleepTime)
    {
        System.Threading.Thread.Sleep(sleepTime);
        return sleepTime + " Task Finished";
    }    
}

private void button1_Click(object sender, System.EventArgs e)
{
localhost.SleepService1 cService = new localhost.SleepService1();
// cb is a function pointer to ServiceCallback
AsyncCallback cb = new AsyncCallback(ServiceCallback);
// Call the Begin method of the proxy class to initiate the
// asynchronous call to the Web Service method.
cService.BeginSleepServiceA(int.Parse(txtA.Text), cb, cService);
}
public void ServiceCallback(IAsyncResult ar)
{
// Retrieve the original state for the proxy
localhost.SleepService1 cService =
(localhost.SleepService1)ar.AsyncState;
// Retrieve the results by calling the End method of the proxy
class
txtResult.Text = cService.EndSleepServiceA(ar);
}