How to get ID in Server Control / C#?

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C#

ASP.NET

controls

I try to write a simple Server Control to control the Banners in my site.

It should be somethink like:

<Banners:mng_bnr ID="Upper_bnr / aside_bnr / bottom_bnr / etc"  runat="server" /> 

And then the Control will be something like:

<%@ Control Language="C#" %> 
 
<script  runat="server"> 
 
 protected void Page_Load(object sender, EventArgs e) 
 { 
 
 
 switch(which_banner) 
 { 
 case which_banner.upper_banner_wide:  
<!-- Ad code --> 
 <script type="text/javascript"><!-- 
JS code 
 </script> 
 <script type="text/javascript" 
 
 </script> 
 <!-- *** Ad Code *** -->  
break; 
 
case which_banner.upper_banner_small: 
 <!-- Ad code --> 
 <script type="text/javascript"><!-- 
JS code 
 </script> 
 <script type="text/javascript" 
 
 </script> 
 <!-- *** Ad Code *** -->  
break; 
 
case which_banner.aside_336_280_top: 
 
 <!-- Ad code --> 
 <script type="text/javascript"><!-- 
JS code 
 </script> 
 <script type="text/javascript" 
 
 </script> 
 <!-- *** Ad Code *** --> 

But, I don't know how to get and handle the ID of each control (there should be around 5-6 controls on each page which every one will have it own ID - which mean different banner)

Thanks a lot.