Sound is not working in Asp.Net Timer

Question

This is working

<embed height="100" width="100" src="WindowsStartup.wav" />

But this is not working

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:Timer ID="Timer1" runat="server" Interval="4000">
    <embed height="100" width="100" src="WindowsStartup.wav" />
</asp:Timer>

How can I fix this ?

Answer 1

The problem source is you're nesting embed tag inside asp:Timer server control:

<asp:Timer ID="Timer1" runat="server" Interval="4000">
    <%-- This should be placed outside --%>
    <embed height="100" width="100" src="WindowsStartup.wav" />
</asp:Timer>

By inspecting rendered HTML output in browser dev tools, I found that the embed tag nested inside Timer control completely disappeared, leaving a hidden span tag with id="Timer1" where asp:Timer placed before:

<span id="Timer1" style="visibility:hidden;display:none;"></span>

To fix this issue, put embed tag outside the control markup, because anything inside server control markup may be reserved for control properties and possibly plain HTML tags inside it not rendered, with exception of certain properties which able to hold HTML templates (eg ItemTemplate ).

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<embed height="100" width="100" src="WindowsStartup.wav" />
<asp:Timer ID="Timer1" runat="server" Interval="4000">
</asp:Timer>

This is rendered output of above markup:

<script type="text/javascript">
//<![CDATA[
Sys.WebForms.PageRequestManager._initialize('ScriptManager1', 'form1', [], [], [], 90, '');
//]]>
</script>

<embed height="100" width="100" src="WindowsStartup.wav" />
<span id="Timer1" style="visibility:hidden;display:none;"></span>