How to Get usernames using jaquery

<script type="text/javascript">

$(document).ready(function () {
$("#MainContent_txtsearch").focus(function () {
jQuery("#MainContent_txtsearch").autocomplete({
source: function (request, response) {
$.ajax({
type: "POST",
contentType: "application/json; charset=uft-8",
url: "Testing.aspx/GetEmployeeName",
data: "{'empname':'" + document.getElementById('MainContent_txtsearch').value + "' }",
dataType: "json",
success: function (data) {
response(data.d)
},
error: function (result) {
}
});
},
minLength: 1,
select: function (event, ui) {
$("#MainContent_txtsearch").val(ui.item.id);

}
}).focus(function () { $(this).autocomplete("search"); });
});
});

</script>



[WebMethod]
public static List<string> GetEmployeeName(string empname)
{

List<string> result = new List<string>();
SqlConnection strcon1 = new SqlConnection(ConfigurationManager.ConnectionStrings["connections2sqlserver"].ConnectionString);
strcon1.Open();
SqlCommand cmd = new SqlCommand("select username from TBL_LoginInfo where username like '" + empname + "%'", strcon1);
//open the connection

SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())
{
result.Add(dr["username"].ToString());
}

}
else
{
result.Add("No Reocrds Found");

}
strcon1.Close();
return result;

}