从下拉列表中的网格视图中选择项目

Question

我有一个使用devexpress的下拉列表中的gridview，我需要能够在页面默认加载时选择并显示其中的一行，我似乎无法做到这一点，因为选择行并显示它？请参见下面的代码。

asp.net

await page.evaluate(() => JSON.stringify(window.performance.timing))

javascript

 <dx:LayoutItem Caption="Sheet" ColSpan="1" HelpText="Select a size">  
    <LayoutItemNestedControlCollection>  
        <dx:LayoutItemNestedControlContainer runat="server">  
            <dx:ASPxDropDownEdit ID="dLeft" runat="server" ClientInstanceName="deItems">  
                <DropDownWindowTemplate>  
                    <dx:ASPxGridView ID="gvItem"  
                                ClientInstanceName="gvItem"  
                                Name="gvItem"  
                                runat="server"  
                                AutoGenerateColumns="False"  
                                DataSourceID="xdsItem"  
                                KeyFieldName="ItemID"  
                                OnRowInserting="gvItem_RowInserting"  
                                Width="100%"  >  
                                    <ClientSideEvents  
                       SelectionChanged="function(s,e){  
                           updateSelectItem(s,e);  
                       }" />  
                        <SettingsPager Visible="False">  
                        </SettingsPager>  
                        <SettingsEditing Mode="Inline">  
                        </SettingsEditing>  
                        <SettingsBehavior AllowSelectByRowClick="True" AllowSelectSingleRowOnly="True" />  
                        <SettingsDataSecurity AllowEdit="False" />  
                        <Columns>  
                            <dx:GridViewCommandColumn  ShowDeleteButton="True"  VisibleIndex="0">  
                            </dx:GridViewCommandColumn>  
                            <dx:GridViewDataTextColumn FieldName="Width" VisibleIndex="2">  
                                <PropertiesTextEdit DisplayFormatString="n0">  
                                </PropertiesTextEdit>  
                            </dx:GridViewDataTextColumn>  
                            <dx:GridViewDataTextColumn FieldName="Height" VisibleIndex="3">  
                                <PropertiesTextEdit DisplayFormatString="n0">  
                                </PropertiesTextEdit>  
                            </dx:GridViewDataTextColumn>  
                        </Columns>  
                        <Toolbars>  
                            <dx:GridViewToolbar>  
                                <Items>  
                                    <dx:GridViewToolbarItem Command="New">  
                                    </dx:GridViewToolbarItem>  
                                </Items>  
                            </dx:GridViewToolbar>  
                        </Toolbars>  
                    </dx:ASPxGridView>  
                </DropDownWindowTemplate>  
                <ValidationSettings ErrorDisplayMode="ImageWithTooltip" ValidationGroup="vFilter">  
                    <RequiredField ErrorText="You must select an item" IsRequired="True" />  
                </ValidationSettings>  
            </dx:ASPxDropDownEdit>  
        </dx:LayoutItemNestedControlContainer>  
    </LayoutItemNestedControlCollection>  
</dx:LayoutItem>