Determine ascx code label value

Good day, not sure what to do.

I have an ascx page with the code displaying the user logged in, i created an iframe src displaying a report but i want to add the logged in id as parameter but can't determine the code value.

ascx page code

Code:

---

<%@ Control Language="c#" AutoEventWireup="True" Codebehind="Header.ascx.cs" Inherits="FlowCentric.Net.Navigator.Header" TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
<tr>           
<td><asp:Label id="lblLogin" runat="server">Welcome</asp:Label></td>
 </tr>

---

the iframe report i add & add the user parameter to the label's lblLogon value.

Code:

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<IFRAME id="frame1" src="http://biweb/reportserver?&User=lblLogin"</IFRAME>

---

Please Assist, totally lost