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The web service GetEmployeDetails(string empid) method perfactly working in localhost but after publishing it and another windows application where we use that method there data is nothing return.

using System;
using System.Collections.Generic;
using System.Linq;

using System.Web;
using System.Web.Services;
using System.Data;


namespace TCTimeTrackerWS.Employee

 /// <summary>
 /// Summary description for Employee
 /// </summary>
 [WebService(Namespace = "http://192.168.31.240/")]
 [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 Employee : System.Web.Services.WebService
 
 [WebMethod]
 public DataTable GetEmployeDetails(string empid)
 
 try
 
 DataTable dt = DBHelperClass.FilldataTableUsingQuery(@"Select firstname,lastname From MST_Employee WHere employeid='"+empid+"'");
 dt.TableName = "empdetails";

 if (dt.Rows.Count > 0)
 
 return dt;
 
 
 catch 
 return null;
 
 
 

In localhost this code is working fine but in IIS Express it is giving me an error in below line dt.TableName = "empdetails";

It will giving me error :
System.NullReferenceException: Object reference not set to an instance of an object.
at TCTimeTrackerWS.GetProject_webservice.GetProject.GetProjectByEmployee(String employeeid) in E:Work Space 2tcprojsWebServiceTCTimeTrackerWSTCTimeTrackerWSGetProject_webserviceGetProject.asmx.cs:line 27

How to Resolve that? thanks in advance...