jquery - VB.NET: Autocomplete multiple names in textbox inside gridview -

i have added textbox in gridview , need add auto complete in it. have implemented single name cant figure out how add other names within same search

on selection autocomplete should append previous selected name

serch class

 <%@ webhandler language="vb" class="search_vb" %>  imports system imports system.web imports system.data.sqlclient imports system.configuration imports system.text  public class search_vb : implements ihttphandler       public sub processrequest(byval context httpcontext) implements ihttphandler.processrequest         try             dim prefixtext string = context.request.querystring("q")             dim prefixarray string() = prefixtext.split(";")          dim conn sqlconnection = new sqlconnection         conn.connectionstring = configurationmanager _                 .connectionstrings("constr").connectionstring         dim cmd sqlcommand = new sqlcommand         cmd.commandtext = ("select firstname participants " & _                            "firstname @searchtext + '%'")             cmd.parameters.addwithvalue("@searchtext", prefixarray(prefixarray.length - 1))         cmd.connection = conn         dim sb stringbuilder = new stringbuilder         conn.open()         dim sdr sqldatareader = cmd.executereader         while sdr.read             sb.append(sdr("firstname")) _                 .append(environment.newline)         end while         conn.close()             context.response.write(sb.tostring)           catch ex exception          end try     end sub      public readonly property isreusable() boolean implements ihttphandler.isreusable                     return false         end     end property  end class 

javascript

<link href="css/jquery.autocomplete.css" rel="stylesheet" type="text/css" />     <script src="scripts/jquery.autocomplete.js" type="text/javascript"></script>     <script type="text/javascript">         function setautocomplete() {             var textboxes = document.getelementsbyclassname("autocompletetextbox");             (var = 0; < textboxes.length; i++) {                   $("#" + textboxes[i].id).autocomplete('search_vb.ashx');             }         }     </script>      <script type="text/javascript">         $(document).ready(function () { setautocomplete(); });      </script> 

please me this