Hello ,
I'm tring to Get Selected Row From GridPanel Using Razor Engine withe this Function 
 {
            if (!string.IsNullOrEmpty(MemberID))
            {
                int selectedMember = int.Parse(MemberID);
                GridPanel gridpanel = X.GetCmp<GridPanel>(GridPanelId);
                MiniSiteDBEntities DBContext = new MiniSiteDBEntities();
                List<CategoryMember> lstCatMem = new List<CategoryMember>();
                var Query = from c in DBContext.CategoryMember
                            where c.MemberID == selectedMember
                            select c;
                lstCatMem = (List<CategoryMember>)Query.ToList();
                RowSelectionModel sm = gridpanel.SelectionModel.Primary as RowSelectionModel;
                sm.SelectedRows.Clear();
                sm.SelectedRow = new SelectedRow(lstCatMem.Count);
                foreach (CategoryMember CategoryMember in lstCatMem)
                {
                    sm.SelectedRows.Add(new SelectedRow(CategoryMember.CategoryID.ToString()));
                }
                sm.UpdateSelection();
                return new AjaxResult();
            }
            return new AjaxResult();

        }
But the Variable sm is alawys Null which is the RowSelection the Razor Code which Call this Function is :
  @(Html.X().FormPanel().ID("BasicForm").Width(1193).Frame(true).Title("Display List Of Categories For Selected Member").AutoHeight(true)
      .PaddingSpec("10px 10px 0 10px")
    .Items(items =>
    {
        items.Add(Html.X().ComboBox().ID("MemberCombo").FieldLabel("List of Members").Width(600).LabelWidth(150).Editable(true).TypeAhead(true).SelectOnFocus(true).Margins("0 0 0 3")
            .QueryMode(DataLoadMode.Local).TriggerAction(TriggerAction.All).ValueField("MemberID").DisplayField("FirstName")
            .Store(Stor =>
            {
                Stor.Add(Html.X().Store().ID("dsMembers1").AutoLoad(true).Model(Mod =>
                {
                    Mod.Add(Html.X().Model().ID("ModelMembers").Fields(
                        FielCat =>
                        {
                            FielCat.Add(Html.X().ModelField().Name("MemberID").Type(ModelFieldType.Int));
                            FielCat.Add(Html.X().ModelField().Name("FirstName"));
                        }
                ));

                }
                    )

                     .Proxy(proxy => proxy.Add(Html.X().AjaxProxy()
                                                              .Url("/Data/GetMembers/")
                        .Reader(reader => reader.Add(Html.X().JsonReader()
                                    .Root("data")
                                           .TotalProperty("total")
                                                   .IDProperty("MemberID")


                                ))


                       ))
                    );
            })
               .DirectEvents(directEvents =>
               {
                   directEvents.Select.Url = "/Data/GetCategoriesForSeletedMember";
                   directEvents.Select.ExtraParams.Add(new StoreParameter("MemberID", "Ext.getCmp('MemberCombo').getValue()", ParameterMode.Value));
                   directEvents.Select.ExtraParams.Add(new StoreParameter("GridPanelId", "GridPanel2"));
               })
           );
    })
So Can I get a help Please .

Thinks .