How Do I Create Dynamic Textbox Which Can Fetch More Entries

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MVC

C#5.0

SQL-Server-2008R2

i want to create dynamic textbox which fetch data from database table using jquery ajax in mvc4,i have done it..here is my code

public JsonResult AutoCompleteTasks(string term)
       {
           var result = (from t in pc.Tasks
                         where t.Name.Contains(term)
                         select new { t.Name }).Distinct();

           return Json(result, JsonRequestBehavior.AllowGet);

       }

and here is ajax,

$("#textarea").autocomplete({

             source: function(request,response) {
                 $.ajax({
                     url: "/Home/AutoCompleteTasks",
                     type: "POST",
                     dataType: "json",
                     data: { term: request.term },
                     success: function (data){
                     {
                         if(data){
                            alert(data.FirstMidName);
                            $("#textarea").val(data.FirstMidName);
                     }
                         response($.map(data, function (item) {
                             return { label: item.Name, value: item.Name };
                         }))
                     }
                 })
             },
             messages: {
                 noResults: "", results: ""
             }
         });

but now i want a textbox which can fetch more than 1 entry separted by commas,like this
task1,task2,task3 in textbox ,how can i do that,,,,,