Is “ctl00_lblTotalValue” the id you assigned to the span or is it a server-side control getting its ID auto-assigned by the environment?
For example, if I have this code in my .NET aspx page
<div id="pnlHeader" runat="server"></div>
it gets rendered in the html page as
<div id="ctl00_pnlHeader"></div>
If that is the case, I need to grab it in the jquery using this syntax
$("#<%= pnlHeader.ClientID%>").text()
If yours is a server-side control, you may need to grab the text using
spanValue = $("#<%= lblTotalValue.ClientID%>").text();
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solved How to grab the value of the span element using jQuery