how can i four dropdownlist search for mvc.net

Maybe if you post some code or sample code we can manage to answer this, my friend.

the codes I use to fill the dropdownlist

controller

  var illerList = _db.iller.ToList();

            List<SelectListItem> item8 = new List<SelectListItem>();
            foreach (var c in illerList)
            {
                item8.Add(new SelectListItem
                {
                    Text = c.ilAdi,
                    Value = c.il_Id.ToString()
                });
            }
            ViewBag.illerList = item8;


            var Derskategorileri = _db.DersKategorileri.ToList();

            List<SelectListItem> item9 = new List<SelectListItem>();
            foreach (var d in Derskategorileri)
            {
                item9.Add(new SelectListItem
                {
                    Text = d.Kategori,
                    Value = d.Id.ToString()
                });
            }
            ViewBag.Derskategorileri = item9;

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html

   @if (ViewBag.illerList != null)
                                        {

                                            @Html.DropDownList("IlId", (IEnumerable<SelectListItem>)ViewBag.illerList, "Şehir Seçiniz", new { @class = "chosen-select" })
                                        }

                                    </div>
                                    <div class="main-search-input-item">

                                    
                                        @Html.DropDownList("IlceId", (IEnumerable<SelectListItem>)ViewBag.illerList, "İlçe Seçiniz")
                                      
                                    </div>
                                    <div class="main-search-input-item location">


                                        @if (ViewBag.Derskategorileri != null)
                                        {

                                            @Html.DropDownList("DkId", (IEnumerable<SelectListItem>)ViewBag.Derskategorileri, "Ders Kategorileri", new { @class = "chosen-select" })

                                            @*@Html.DropDownListFor(model => model.Item2.il_Id, ViewBag.illerList as SelectList, "---İl Seçiniz---", new { @class = "form-control", Id = "il_Id" })*@
                                        }

                                    </div>
                                    <div class="main-search-input-item">

                                        @Html.DropDownList("BdId", (IEnumerable<SelectListItem>)ViewBag.Derskategorileri, "Ders Seçiniz", new { @class = "form-control" })
                                    
                                    </div>

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this code

according to these codes, I have four dropdown lists and I want to search and list them in another page