c# - How to display elements only if SQLDataSource has rows -

i'm creating asp.net/c# page user enters id @ top of page, , when press submit, page posts , displays data. right now, data fields displayed @ times - when page loads , no search has taken place. not ideal when navigate menu multiview have made, errors come up. plus it's not practise.

is there way can hide these elements (they detailsviews , gridviews, plus multiview , menu) if sqldatasource blank? if search returned nor esults, or no query has been executed yet.

thanks

you surround these elements placeholder control , set placeholders visibility depending on whether there result display.
haven't used sqldatasource object before meet requirements suggest checking see if page has been posted in pageload method , if not hiding data controls. handle case of no results being returned adding method sqldatasource.selected event:
aspx:

<asp:placeholder id="myplaceholder" runat="server">      ....data controlds </asp:placeholder> 

code behind:

protected void page_load(object sender, eventargs e) {     if(!ispostback)     {              myplaceholder.visible = false;     } }  protected void sqldatasource1_selected(object sender, sqldatasourcestatuseventargs e) {     myplaceholder.visible = e.affectedrows > 0; }