Save (Insert) HTML Select (DropDownList) Item in database using Model in ASP.Net MVC

Hi,

I tried to save dropdown in the database, it save but the data is blank

 Model (ItemModel)

    public class ItemModel
    {   
        public string Requester_id { get; set; }        
        public int item_id { get; set; }
        public string req_material { get; set; }
        public Nullable<int> req_quantity { get; set; }
    }

View

        <div id="tabs-2">
        @using (Html.BeginForm("AddMaterial", "Home", FormMethod.Post))
        {
            @Html.AntiForgeryToken()
            @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-inline">

            <label for="Material" class="mr-sm-2">Material:</label>
            <select>
                <option value="0">Select</option>
                @foreach (var item in ViewBag.material)
                {
                    <option value='@item.ID'>@item.Material</option>
                }
            </select>
            <span><label for="st" class="mr-sm-2">Quantity:</label></span>
            <select>
                <option value="0">Select</option>
                @{
                    for (int i = 1; i <= 100; i++)
                    {
                        <option value="@i">@i</option>
                    }
                }
            </select>

            <div class="form-group">
                <div class="col-md-offset-2 col-md-10">
                    <input type="submit" value="Save" class="btn btn-primary" />
                </div>
            </div>
        </div>
        }
        <br />

        @webGrid.GetHtml(
            htmlAttributes: new { @id = "WebGrid", @class = "table table-striped table-hover" },
            columns: webGrid.Columns(
                     webGrid.Column("No.", format: item => item.WebGrid.Rows.IndexOf(item) + 1 + Math.Round(Convert.ToDouble(webGrid.TotalRowCount / webGrid.PageCount) / webGrid.RowsPerPage) * webGrid.RowsPerPage * webGrid.PageIndex),
                     webGrid.Column("req_material", "Material"),
                     webGrid.Column("req_quantity", "Quantity")
                    ))        
    </div>

Controller

        [HttpPost]
        public ActionResult AddMaterial(ItemModel model, string id)
        {
            TempData["Selected"] = "1";
            id = Convert.ToString(TempData["NewID"]);
            try
            {
                Material_Item item = db.Material_Item.Where(x => x.item_id == model.item_id).FirstOrDefault();

                item = new Material_Item();

                item.item_id = model.item_id;
                item.Requester_id = id;
                item.req_quantity = model.req_quantity;
                item.req_material = model.req_material;
               

                db.Material_Item.Add(item);
                db.SaveChanges();

            }
            catch (Exception)
            {

            }

            return RedirectToAction("FormRequest", "Home");
        }