Using AutocompleteExtender getting multiple data

CREATE TABLE [dbo].[empMaster] (
	[empcode] [varchar] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
	[empname] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL 
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using System.Data.SqlClient;

using System.Collections.Generic;

/// 

/// Summary description for AutoSuggest
/// 

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 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 AutoSuggest : System.Web.Services.WebService
{

   [WebMethod]
    public string[] GetEmployeeList(string prefixText)
    {
        strQuery="select empcode,empname from empMaster";
        SqlDataReader rdrSql;
        rdrSql=SqlHelper.ExecuteReader(strConn,CommandType.Text,strQuery);
	while (rdrSql.Read())
	{
	       String vempid=rdrSql.GetString(0);
	       String vEmpid=rdrSql.GetString(1);
               string item = AjaxControlToolkit.AutoCompleteExtender.CreateAutoCompleteItem("Emp Name : " + vempname + "  - Emp code : " + vEmpid, vEmpid);
            names.Add(item);
        }
        return names.ToArray();
    
    }
    

}

   ScriptManager ID="ScriptManager1" runat="server" >
       
                ServiceReference Path="AutoSuggest.asmx" />
               
            
       
    
   b) Add a label and name as lblEmpCode
      Label ID="lblEmpCode" runat="server">
   c) Add javaScript tag. Add the function below:
                           
                function GetCode(source, eventArgs ){
               
                var textval=eventArgs.get_text();
               var temp = new Array();
                temp = textval.split('-');
              
                var temp1=new Array();
                temp1=temp[0].split(':');
                
                var txtval=temp1[1];
                //alert(txtval);
                var txtNameEl=document.getElementById("txtEmpName");
               var elMyElement = document.getElementById("lblEmpCode");
               elMyElement.innerHTML= eventArgs.get_value();
               txtNameEl.innerText=txtval.trim();
                
                }

      
AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" MinimumPrefixLength="1" TargetControlID="txtEmpName" ServiceMethod="GetEmployeeList" ServicePath= "AutoSuggest.asmx"  CompletionInterval="1" EnableCaching="true" CompletionSetCount="10"  OnClientItemSelected="GetCode">