How to insert dropdown selected text in databse in MVC using formcollection

[HttpPost]
       public ActionResult AddMachine(FormCollection fc, HttpPostedFileBase file)
       {
           admachinecat();

           //admachinesubcat();
           ad.machinetype = fc["Drop"];
           ad.machinesubtype = fc["sDrop"];
           ad.machinesub_subtype = fc["subDrop"];

           ad.modelnum = fc["modelnum"];
           ad.menufacture = fc["Manufacturer"];
           ad.manufacturecat = fc["modelcat"];
           ad.File = file;
           ad.productspec = fc["product_speci"];
           ad.productdetail = fc["Editor1"];
           if (ModelState.IsValid)
           {
               int result = dab.admachine(ad);
               ViewData["result"] = result;
               ModelState.Clear();

               return View();

           }
           else
           {
               ModelState.AddModelError("", "error in saving data");
               return View();

           }

       }



 public void admachinecat()
        {

            DataSet ds = dab.subcatdropdown();
            ViewBag.menulist = ds.Tables[0];
            List<SelectListItem> branchitems = new List<SelectListItem>();
            branchitems.Add(new SelectListItem
             {
                 Text = "---select---",
                 Value = "0",

             });
            foreach (DataRow dr in ViewBag.menulist.Rows)
            {


                branchitems.Add(new SelectListItem { Text = @dr["Category_Name"].ToString(), Value = @dr["Category_Id"].ToString() });
            }
            ViewBag.Drop = branchitems;



        }
IN DATABASE ACCESS LAYER:
        public DataSet subcatdropdown()
        {
            SqlCommand cmd = new SqlCommand("select Category_Id,Category_Name from Category", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
}







in HTML pAge:

   <div class="col-sm-6">@Html.DropDownList("Drop")

What I have tried:

i do all this. but it store in database dropdown selected value.
but i want to store text. how can i do that?</div>