Web services are a great tool to share data across many data sources within a single organization, even if the owners of the different sources don’t want to give others direct access to the data.
here I am showing how you can call web service in classic asp.
To start, create a Web Service in Visual Studio.NET or use existing web service.
here is my web service login.asmx coding file (login.cs),

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Services;
using System.Web.Script.Services;
///
/// Summary description for Login
/// <code>
[WebService(Namespace = "http://ashishblog.com/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[ScriptService]
public class Login : System.Web.Services.WebService {
[WebMethod]
public int LoginValidate(string email, string PW)
{
bool OK = false; 

// validate email or pW
if(email =="[email protected]" && PW=="ashish")
{
OK = true;
}
return OK;
}
}

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