How Can I Use Jason In Asptokeninput

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ASP.NET

Ajax

jQuery

plugin

i use this code to bring user's names from database :

//javaScript

function OnUserChange(s, e) {
$(s.GetInputElement()).autocomplete({
source: function (request, response) {
$.ajax({
type: 'POST',
contentType: "application/json; charset=utf-8",
url: global.path + '/Mail/NewMail.aspx/GetUsers',
data: "{'keyword':'" + request.term + "'}",
dataType: "json",
async: false,
success: function (data) {
data = jQuery.parseJSON(data.d);
response($.map(data, function (item) {
return {
label: item.FullName,
value: item.FullName,
id: item.UserID
}
}))
}
});
}
});
}

//get user to use it in auotocomplete textbox

  [WebMethod]
   public static string GetUsers(string keyword)
   {
       User user = new User();
       string jsonData = JsonConvert.SerializeObject(user.GetAllUsers(keyword));
return jsonData;
}

how can i pass this function to asptokeninput control to get multiple autocomplete values
please help me