JSON response returning null when local webservice called

Hello everyone,

I have made a simple webservice in asp.net, my service.asmx file contains webmethod as :

[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public void HelloWorld() {
      JavaScriptSerializer serializer = new JavaScriptSerializer();
        string jsonData = serializer.Serialize("Hello World");
        Context.Response.ContentType = "application/json; charset=utf-8";
        Context.Response.Write(jsonData);
        //return jsonData;
}

This webservice returns me output of "Hello World"

Now i have hosted this webservice on IIS and accessing this webservice from localhost also works very fine.

Now i have created one website in asp.net in which there is a button which invokes this webservice through AJAX and JSON

The code is :

      function invokeService() {

          $.ajax({
              url: "http://localhost/SampleService/Service.asmx/HelloWorld",
              type: "POST",
              contentType: "application/json; charset=utf-8",
              dataType: "json",
              success: function (msg) {
                  alert(msg);
              },
              error: function () {
                  alert("this error");
              }
          });
          return false;
      }
<input type="button" id="btnInvokeService" value="Invoke Service" onclick ="invokeService();" />

Now the invokeService method is called of jSON but the output i am returning is "null" value..

I have also tried to change webservice webmethod with returning string value but the end result is same.

Please help me how can i achieve output in JSON alert as Hello world.. Please help me

Thanking you in advance.

Krunal

Tags: C#, Ajax, ASP.NET, JSON, Webservice