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Editorial Team
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Asked: 2026-06-09T08:12:09+00:00

I’ve got an issue with a messagebox user control. I wish for a control

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I’ve got an issue with a messagebox user control. I wish for a control which can be given a message and the user can dismiss with a click of a button, which can be inserted into many places.
I have applied the javascript into the messagebox control in a hope i can keep everything to do with the messagebox centralized, however when browsing to a page with the messagebox control added i get this error:

CS1061: 'ASP.components_messagebox_ascx' does not contain a definition for 'HideBox' and no extension method 'HideBox' accepting a first argument of type 'ASP.components_messagebox_ascx' could be found

The control is as thus: 

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Messagebox.ascx.cs" Inherits="FosterNetwork.Components.Messagebox" %>
<script type="text/Javascript">
    function HideBox() {
        document.getElementById("PNL_Messagebox").setAttribute("visible", false);
    }
</script>
<asp:Panel ID="PNL_Messagebox" runat="server">
    <asp:Label ID="LBL_Message" runat="server" />
    <asp:Button ID="BTN_Ok" Text="Ok" OnClick="HideBox()" runat="server" /> <!--Error happens on this line-->
</asp:Panel>

I’m fairly certain i’ve done this right but obviously i’ve done something wrong if it’s not working. Any light on the situation at all would be grand.

Addendum: If i comment out the Button control the page loads fine, and the script loads fine too (Viewed page source)

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1 Answer

  1. Editorial Team

    The control ID’s you’re referencing are not the client ID’s, but server ID’s. So retrieve the ‘ClientID’ from the control in the JavaScript function and second, use the ‘OnClientClick’ property to show the JavaScript message.

    <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Messagebox.ascx.cs" Inherits="FosterNetwork.Components.Messagebox" %>
<script type="text/Javascript">
    function HideBox() {
        document.getElementById("<%= PNL_Messagebox.ClientID %>").setAttribute("visible", false);
    }
</script>
<asp:Panel ID="PNL_Messagebox" runat="server">
    <asp:Label ID="LBL_Message" runat="server" />
    <asp:Button ID="BTN_Ok" Text="Ok" OnClientClick="HideBox()" runat="server" /> <!--Error happens on this line-->
</asp:Panel>
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