ช่วยสอนวิธี บวก ลบ datatable หน่อยครับ ทำไม่ได้จริงๆครับ (Web,Mc)

var oTable = $('#MyDatatable').DataTable({
                    "ajax": {
                        "url": '/home/GetStock',
                        "type": "get",
                        "datatype": "json"
                    },
                    "columns": [
                        { "data": "SerialCode", "autoWidth": true },
                        { "data": "MaterialName", "autoWidth": true },
                        { "data": "UnitName", "autoWidth": true },
                        { "data": "Quantity", "autoWidth": true },
                        { "data": "InputDate", "autoWidth": true },
                        {
                            "data": "Product_ID", "width": "50px", "render": function (data) {
                                return '<a class="popup" href="/home/edit/' + data + '">Edit</a>';
                            }
                        },
                        {
                            "data": "Product_ID", "width": "50px", "render": function (data) {
                                return '<a class="popup" href="/home/delete/' + data + '">Delete</a>';
                            }
                        }

@model Data_table.Models.tblStock

<h2>Save Product</h2>
@using (Html.BeginForm("save", "home", FormMethod.Post, new { id = "popupForm" }))
{
    if (Model != null && Model.Product_ID > 0)
    {
        @Html.HiddenFor(a => a.Product_ID)
    }

    <div class="form-group">
        <label>Serial Code</label>
        @Html.TextBoxFor(a => a.SerialCode, new { @class = "form-control" })
        @Html.ValidationMessageFor(a => a.SerialCode)
    </div>
    
    <div class="form-group">
        <label>Product Name</label>
        @Html.TextBoxFor(a => a.MaterialName, new { @class = "form-control" })
        @Html.ValidationMessageFor(a => a.MaterialName)
    </div>

    <div class="form-group">
        <label>Unit Name</label>
        @Html.TextBoxFor(a => a.UnitName, new { @class = "form-control" })
        @Html.ValidationMessageFor(a => a.UnitName)
    </div>

    <div class="form-group">
        <label>Quantity</label>
        @Html.TextBoxFor(a => a.Quantity, new { @class = "form-control" })
        @Html.ValidationMessageFor(a => a.Quantity)
    </div>

    <div class="form-group">
        <label>InputDate</label>
        @Html.EditorFor(a => a.InputDate, new { htmlAttributes = new { @class = "datepicker", @Value = DateTime.Now } })
        @Html.ValidationMessageFor(a => a.InputDate)
    </div>

    <div>
        <input type="submit" value="Save"/>
    </div>