How to call a Webmethod using jquery?

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C#

jQuery

webservice

Hi Experts!
I have created a webmethod:-

public class RailMapDoc : System.Web.Services.WebService
   {

       [WebMethod(EnableSession = true)]
       [ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = true)]
       public void GetDocsCount(string locAddr)
       {

          // if (Session["login"] != null)
          // {
               using (Docs2GoEntities db = new Docs2GoEntities())
               {
                   var docCount = db.LocDocMappings.Select(l => new { longitude =       l.tblLocation.longitude, latitude = l.tblLocation.latitude, number_of_documents = db.LocDocMappings.Where(ld => ld.locationId == l.locationId && ld.V01_PR.V01_PG.PRONO == "ABKET").Count() }).Distinct();
                   HttpContext.Current.Response.Write(new JavaScriptSerializer().Serialize(docCount));
               }

         //  }
       }
   }

when I am executing this then it is giving link of service method i.e "GetDocsCount". using this link.
http://localhost:52517/RailMapDoc.asmx"
after invoking the method i am getting my json data.
how to consume this data using jquery, below is the code i am using to get the json data using jquery.

var GisMapWithTags = function () {
              $.getJSON("RailMappDoc.asmx/GetDocsCount", function (json) {
                  jsonString = json;
              }).done(function () {
                  ArcGisMap();
              }).fail(function () {
                  alert("Error");
              });
          }

I am not able to get the data, where i am doing wrong please suggest me.

Thanks