How to call a web service from JavaScript with asp.net Ajax

Calling a web service from JavaScript was easy task earlier you need to create a proxy class for JavaScript and then you need to write lots of java script but with Microsoft ASP.NET Ajax you can call web services from JavaScript very easily with some line of JavaScript and even better you can also handle the errors if web service failed to return result. Let’s create a simple hello world web service which will print Hello world string and then we will call that web service into JavaScript. Following is a code for web service.

namespace DotNetJapsSocial
{
 /// <summary>
 /// Summary description for HelloWorld
 /// </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 HelloWorld : System.Web.Services.WebService
 {
     [WebMethod]
     public string PrintHelloWolrdMessage()
     {
         return "Hello World";
     }
 }
}

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