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<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<%if (Request.Cookies["urlSound"]!= null){%>
<embed src='<%=Request.Cookies["urlSound"].Value %>' autostart="true" loop="-1" width="0" height="0" ></embed>
<%} %>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
protected void Button1_Click(object sender, EventArgs e)
{
Response.Cookies["urlSound"].Value = "Sound/a1.wma";
}