c# - AutoComplete functionality not firing -

i have project using asp.net 4.5 , c#. have textbox server control tied asp autocompleteextender. problem seems either not connection database there bug somewhere in code. not using web service simple aspx , aspx.cs code behind. haven't been able debug pinpoint actual problem yet because getting

uncaught exception thrown method called through reflection

and in process of figuring out causing problem.

here textbox control:

<div class="col-md-10">                           <asp:textbox id="txtcontactssearch" runat="server"></asp:textbox>             <cc1:autocompleteextender servicemethod="searchcustomers"                 minimumprefixlength="2"                 completioninterval="100" enablecaching="false" completionsetcount="10"                 targetcontrolid="txtcontactssearch"                 id="autocompleteextender1" runat="server" firstrowselected="false">             </cc1:autocompleteextender>             <asp:requiredfieldvalidator runat="server" controltovalidate="studentid" cssclass="text-danger" display="dynamic" errormessage="the student id field required." />         </div>           

and have ajax directive on declared on aspx page aswell:

<%@ register assembly="ajaxcontroltoolkit" namespace="ajaxcontroltoolkit" tagprefix="cc1" %> 

and code behind implements functionality autocomplete:

using system; using system.collections.generic; using system.linq; using system.web; using system.data; using system.configuration; using system.data.sqlclient; using system.web.ui; using system.web.ui.webcontrols;  public partial class searchstudent : system.web.ui.page {     protected void page_load(object sender, eventargs e)     {      }       [system.web.script.services.scriptmethod()]     [system.web.services.webmethod]     public static list<string> searchstudents(string prefixtext, int count)     {         using (sqlconnection conn = new sqlconnection())         {             conn.connectionstring = configurationmanager                     .connectionstrings["defaultconnection"].connectionstring;             using (sqlcommand cmd = new sqlcommand())             {                 cmd.commandtext = "select fname student_registration_form " +                 "fname @searchtext + '%'";                 cmd.parameters.addwithvalue("@searchtext", prefixtext);                 cmd.connection = conn;                 conn.open();                 list<string> students = new list<string>();                 using (sqldatareader sdr = cmd.executereader())                 {                     while (sdr.read())                     {                         students.add(sdr["fname"].tostring());                     }                 }                 conn.close();                 return students;             }         }     } } 

the issue caught attention is: calling wrong method in autocomplete extender

<cc1:autocompleteextender servicemethod="searchcustomers"  public static list<string> searchstudents(string prefixtext, int count)     { 

here can see have passed searchcustomers servicemehtod in page using searchstudents.

recently have tried twitter's typeahead autocomplete plugin easy , fast compare autocomplete extender. have might : textbox autocomplete using twitter typeahead in asp .net