Row Edit and Row Selection ASPxGridView

<asp:UpdatePanel ID="UpdatePanel8" runat="server">
                        <ContentTemplate>
                            <dx:ASPxGridView ID="grid"  runat="server" Width="100%" AutoGenerateColumns="False" ClientInstanceName="grid" EnableRowsCache="False" KeyFieldName="ProductCode"
                                 önRowUpdating="grid_RowUpdating" >
                                <TotalSummary>
                                    <dx:ASPxSummaryItem FieldName="Qty" ShowInColumn="Qty" ShowInGroupFooterColumn="Qty"
                                        SummaryType="Sum" DisplayFormat="#.###" />
                                    <dx:ASPxSummaryItem FieldName="QtyReceive" ShowInColumn="QtyReceive" ShowInGroupFooterColumn="QtyReceive"
                                        SummaryType="Sum" DisplayFormat="#.###" />
                                </TotalSummary>
                                <Columns>
                                    <dx:GridViewDataTextColumn VisibleIndex="0" Caption="No" Width="40px" ReadOnly="True"
                                        HeaderStyle-HorizontalAlign="Center">
                                        <DataItemTemplate>
                                            <dx:ASPxLabel ID="lblRowID_T1"  runat="server" Text='<%# Container.ItemIndex + 1 %>'>
                                            </dx:ASPxLabel>
                                        </DataItemTemplate>
                                        <HeaderStyle Font-Names="Arial" Font-Size="10pt" Font-Bold="true" HorizontalAlign="Center"
                                            VerticalAlign="Middle" Wrap="True" />
                                        <CellStyle Wrap="False">
                                        </CellStyle>
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn Caption="Artikel" FieldName="ProductCode" ReadOnly="True"
                                        VisibleIndex="1" Width="30%">
                                        <HeaderStyle Font-Names="Arial" Font-Size="10pt" Font-Bold="true" HorizontalAlign="Center"
                                            VerticalAlign="Middle" Wrap="True" />
                                        <CellStyle Font-Names="Arial" Font-Size="10pt" Wrap="False">
                                        </CellStyle>
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn Caption="Nama Produk" FieldName="ProductName" ReadOnly="True"
                                        VisibleIndex="2" Width="30%">
                                        <HeaderStyle Font-Names="Arial" Font-Size="10pt" Font-Bold="true" HorizontalAlign="Center"
                                            VerticalAlign="Middle" Wrap="True" />
                                        <CellStyle Font-Names="Arial" Font-Size="10pt" Wrap="False">
                                        </CellStyle>
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn Caption="Tema" FieldName="TemaCode" ReadOnly="True" VisibleIndex="3"
                                        Width="30%">
                                        <HeaderStyle Font-Names="Arial" Font-Size="10pt" Font-Bold="true" HorizontalAlign="Center"
                                            VerticalAlign="Middle" Wrap="True" />
                                        <CellStyle Font-Names="Arial" Font-Size="10pt" Wrap="False">
                                        </CellStyle>
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn Caption="Qty" FieldName="Qty" ReadOnly="True" VisibleIndex="4"
                                        Width="100px">
                                        <HeaderStyle Font-Names="Arial" Font-Size="10pt" Font-Bold="true" HorizontalAlign="Center"
                                            VerticalAlign="Middle" Wrap="True" />
                                        <CellStyle Font-Names="Arial" Font-Size="10pt" Wrap="False" HorizontalAlign="Center">
                                        </CellStyle>
                                        <FooterCellStyle HorizontalAlign="Center">
                                        </FooterCellStyle>
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataSpinEditColumn Caption="Qty Terima" FieldName="QtyReceive" ShowInCustomizationForm="True"
                                        VisibleIndex="5" Width="100px" CellStyle-HorizontalAlign="Center">
                                        <PropertiesSpinEdit DisplayFormatString="g" Spacing="0">
                                        </PropertiesSpinEdit>
                                        <EditItemTemplate>
                                            <dx:ASPxSpinEdit ID="seQty"  runat="server" Font-Names="Arial" Font-Size="10pt" Width="90px"
                                                Number="0" Text='<%# Bind("QtyReceive") %>' MaxValue="1000000" SpinButtons-ShowIncrementButtons="False"
                                                SpinButtons-ShowLargeIncrementButtons="True" LargeIncrement="1">
                                            </dx:ASPxSpinEdit>
                                        </EditItemTemplate>
                                        <HeaderStyle Font-Names="Arial" Font-Size="10pt" Font-Bold="true" HorizontalAlign="Center"
                                            VerticalAlign="Middle" Wrap="True" />
                                        <CellStyle Font-Names="Arial" Font-Size="10pt" Wrap="False">
                                        </CellStyle>
                                        <FooterCellStyle HorizontalAlign="Center">
                                        </FooterCellStyle>
                                    </dx:GridViewDataSpinEditColumn>
                                    <dx:GridViewCommandColumn ShowSelectCheckbox="true" VisibleIndex="8">
                                    </dx:GridViewCommandColumn>
                                    <dx:GridViewCommandColumn VisibleIndex="7">
                                        <EditButton Visible="True">
                                        </EditButton>
                                    </dx:GridViewCommandColumn>
                                </Columns>
                                <SettingsBehavior ColumnResizeMode="Control" ProcessSelectionChangedOnServer="true"/>
                                <SettingsPager NumericButtonCount="100" PageSize="100" />
                                <SettingsEditing Mode="Inline" />
                                <Settings ShowGroupedColumns="True" ShowHorizontalScrollBar="True" ShowFilterRow="true"
                                    ShowFilterRowMenu="true" ShowFooter="True" />
                                <Images SpriteCssFilePath="~/App_Themes/Office2010Silver/{0}/sprite.css">
                                    <LoadingPanelOnStatusBar Url="~/App_Themes/Office2010Silver/GridView/Loading.gif">
                                    </LoadingPanelOnStatusBar>
                                    <LoadingPanel Url="~/App_Themes/Office2010Silver/GridView/Loading.gif">
                                    </LoadingPanel>
                                </Images>
                                <ImagesFilterControl>
                                    <LoadingPanel Url="~/App_Themes/Office2010Silver/GridView/Loading.gif">
                                    </LoadingPanel>
                                </ImagesFilterControl>
                                
                            </dx:ASPxGridView>
                            <br />
                            <asp:UpdateProgress runat="server" ID="UpdateProgress" AssociatedUpdatePanelID="UpdatePanel8"
                                DisplayAfter="0" DynamicLayout="false">
                                <ProgressTemplate>
                                    <img alt="In progress..." src="Image/7.gif">
                                </ProgressTemplate>
                            </asp:UpdateProgress>
                        </ContentTemplate>
                    </asp:UpdatePanel>