Dropdown search not working

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C#

MVC5

This is how my search looks like in a Contoller

IEnumerable<view_service> schedule_name = db.Database.SqlQuery<models.view_service>(sql).ToList();


            // searching string filter
            if (current_filter == null || current_filter == "_")
                current_filter = "";

            ViewBag.current_filter = current_filter;

            // search string in schedule_name by bus_name and driver_name
            if (!String.IsNullOrEmpty(current_filter))
                schedule_name = schedule_name.Where
                    (s => s.code.ToUpper().Contains(current_filter.ToUpper()));

            
            //sorting order by code, name, insert_timestamp  

            ViewBag.code = sort_order == "code" ? "code_desc" : "code";
            ViewBag.name = sort_order == "name" ? "name_desc" : "name";
            ViewBag.insert_timestamp = sort_order == "insert_timestamp" ? "insert_timestamp_desc" : "insert_timestamp";

            ViewBag.current_sort = sort_order;
            switch (sort_order)....

The output is search box that searches code and it works fine. I also have dropdownlist that unfotunetly doesen't give back search results by name.
Code in view looks like this

<select data-placeholder="Choose schedule..." class="chosen-select-group" style="width: 260px;" tabindex="-1" value="@ViewBag.current_filter">
                                    --Choose schedule--
                                    @foreach (var item in ViewBag.schedules)
                                {
                                    if (item.id.ToString() == ViewBag.Schedule_id.ToString())
                                    {
                                        @item.name
                                    }
                                    else
                                    {
                                        @item.name
                                    }
                                }       
</select>

What should i ad to my search string that would filter name in dropdown?

What I have tried:

I have tried adding same search string that i have for code search. I tried List<>, Select List - maybe not correct.