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Asked: 2026-05-10T19:00:11+00:00

I have a Page that has a single instance of a UserControl that itself

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I have a Page that has a single instance of a UserControl that itself has a single UpdatePanel. Inside the UpdatePanel are several Button controls. The Click event for these controls are wired up in the code-behind, in the Init event of the UserControl.

I get the Click event for the first button I push, every time, no problem. After that, I only get Click events for one button (SearchButton) – the rest are ignored. I have included the code for the control below – for sake of brevity, I have excluded the click event handler methods, but they are all of the standard ‘void Button_Click(object sender, EventArgs e)’ variety. Any ideas?

<asp:UpdatePanel ID='PickerUpdatePanel' runat='server' UpdateMode='Conditional'>     <ContentTemplate>         <asp:Panel ID='Container' runat='server'>             <div>                 <asp:TextBox ID='PickerResults' runat='server' style='margin-right: 3px;' SkinID='Plain' />                 <asp:Image                     ID='LaunchPopup' runat='server' ImageUrl='~/images/icons/user_manage.png'                      ImageAlign='Top' BorderColor='#294254' BorderStyle='Dotted' BorderWidth='1px'                      Height='20px' Width='20px' style='cursor: pointer;' />             </div>             <asp:Panel ID='PickerPanel' runat='server' DefaultButton='OKButton' CssClass='popupDialog' style='height: 227px; width: 400px; padding: 5px; display: none;'>                 <asp:Panel runat='server' id='ContactPickerSearchParams' style='margin-bottom: 3px;' DefaultButton='SearchButton'>                     Search: <asp:TextBox ID='SearchTerms' runat='server' style='margin-right: 3px;' Width='266px' SkinID='Plain' />                     <asp:Button ID='SearchButton' runat='server' Text='Go' Width='60px' SkinID='Plain' />                 </asp:Panel>                 <asp:ListBox ID='SearchResults' runat='server' Height='150px' Width='100%' SelectionMode='Multiple' style='margin-bottom: 3px;' />                 <asp:Button ID='AddButton' runat='server' Text='Add >>' style='margin-right: 3px;' Width='60px' SkinID='Plain' />                 <asp:TextBox ID='ChosenPeople' runat='server' Width='325px' SkinID='Plain' />                 <div style='float: left;'>                     <asp:Button ID='AddNewContact' runat='server' SkinID='Plain' Width='150px' Text='New Contact' />                 </div>                 <div style='text-align: right;'>                     <asp:Button ID='OKButton' runat='server' Text='Ok' SkinID='Plain' Width='100px' />                 </div>                 <input id='SelectedContacts' runat='server' visible='false' />             </asp:Panel>             <ajax:PopupControlExtender ID='PickerPopEx' runat='server' PopupControlID='PickerPanel' TargetControlID='LaunchPopup' Position='Bottom' />         </asp:Panel>    </ContentTemplate>    <Triggers>         <asp:AsyncPostBackTrigger ControlID='AddButton' EventName='Click' />         <asp:AsyncPostBackTrigger ControlID='SearchButton' EventName='Click' />         <asp:AsyncPostBackTrigger ControlID='AddNewContact' EventName='Click' />     </Triggers> </asp:UpdatePanel>  public partial class ContactPicker : System.Web.UI.UserControl {     protected void Page_Init(object sender, EventArgs e)     {         SearchButton.Click += new EventHandler(SearchButton_Click);         AddButton.Click += new EventHandler(AddButton_Click);         OKButton.Click += new EventHandler(OKButton_Click);     }      // Other code left out }
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1 Answer

  1. It seems that adding UseSubmitBehavior=’false’ to the button definitions has solved my problem. Still don’t know why that first button click worked at all.

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