kendo ui Grid "Popup mode" ,Edit And Delete Button, Not firing the Controller Action

Question

This is My view with kendo ui grid, It's Read function firing just fine, but the problem just begins when I want to update, The update Function in my controller Not even Firing,

<script>

    $(document).ready(function () {
        var dataSource = {
            transport: {
                type: "json",
                read: {
                    url: "@Html.Raw(Url.Action("CommentList", "Comment"))",
                    type: "POST",
                    dataType: "json"
                },
                update: {
                    url: "@Html.Raw(Url.Action("CommentUpdate", "Comment"))",
                    type: "POST",
                    dataType: "json"
                },
                destroy: {
                    url: "@Html.Raw(Url.Action("CommentDelete", "Comment"))",
                    type: "POST",
                    dataType: "json"
                }
            },
            schema: {
                data: "Data",
                total: "Total",
                errors: "Errors",
                model: {
                    id: "Id",
                    fields: {
                        Id: { type: "number" },
                        ProductName: { editable: false, type: "string"},
                        ProductPicture: { editable: false, type: "string"},
                        Text: { editable: false, type: "string"},
                        AdminConfirm: { editable: true, type: "boolean", validation: { required: true } }
                    }
                }
            },
            requestEnd: function (e) {
                if (e.type === "create" || e.type === "update") {
                    this.read();
                }
            },
            error: function (e) {
                alert("something wrong!");
                // Cancel the changes
                this.cancelChanges();
            },
            pageSize: 15,
            serverPaging: true,
            serverFiltering: true,
            serverSorting: true
        };
        $("#grid").kendoGrid({
            dataSource: dataSource,
            pageable: {
                refresh: true,
                pageSizes: [10, 15, 20, 30, 50]
            },
            height: 550,
            columns: [
                {
                    field: "ProductName",
                    title: "product name",
                    width: "90px"
                },
               {
                   field: "ProductPicture",
                   title: "picture",
                   width: "100px",
               },
                {
                    field: "Text",
                    title: "comment",
                    width: "180px"
                },


                 {
                     field: "AdminConfirm",
                     title: "adminconfirm",
                     width: "70px",

                 },
                {
                    command: [
                        {
                            name: "edit" , text: { // sets the text of the "Edit", "Update" and "Cancel" buttons
                                edit: "edit",
                                update: "update",
                                cancel: "cancel"
                            }
                        }
                    ],
                    title: "&nbsp;", width: "250px"
                }
            ],

            editable  : {
                mode : "popup",
                window : {
                    title: "confirmation form"
                }}
        });
    });

  </script>
 </div>

This is My first line of update Function

    [HttpPost]
       public ActionResult CommentUpdate(DataSourceRequest request, CommentViewModel comment)

Anybody Know Why? Thanx in Advance