[Solved] how to fill 2nd combobox with asp.net mvc ajax

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One of the options is to to make Ajax request to action which will return your list items

  public virtual JsonResult GetCountryStates()
        {
            return Json(
                new
                {
                    new List<SelectListItem>() {YOUR ITEMS HERE}
                });
        }

Then in your Ajax callback body put code like that

function (data) {
                //var selValue;

                data = $.map(data, function (item, a) {
                    if (item.Selected) {
                        selValue = item.Value;
                    }
                    return "<option value=\"" + item.Value + "\" " + (item.Selected ? "selected" : "") + ">" + item.Text + "</option>";
                });
                $('statesSelect').html(data.join(""));
                $('statesSelect').val(selValue);
            },

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solved how to fill 2nd combobox with asp.net mvc ajax