Problem in fetching the value

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ASP.NET

Dear sir/ma'am

i am using vb.net,asp.net with sqlserver 2000.
in one of my website form i make an autosuggestion box with using code in aspx page is

function LoadList()
    {
        var ds=null;
        ds = <%=listFilter %>;
            $( "#tb_empid" ).autocomplete({
              source: ds
            });
    }
  var Txt = document.getElementByID("tb_empid");
function tb_empid_onclick() {

}

the autosuggest box is an input box when i write a then all the values having a show in a list and then i select one value among them.
now i want to save this value in my database but when i try to access this value from my vb page then no such a input control i find so how can i access this inputbox value in my vb page variable

now sir i want the selected value redirect in my .vb page .
but i am failed to access the selected value .