How to pass a c# variable to a sql datasource (asp c# sql server)

Hi, please see the code below.  I am trying to access a c# variable in a sqldatasource definition.  Could someone please tell me what I need to change to that I can use the domain variable in the WHERE?  Thanks!  I've been trying for hours...   (I am new to asp, c#  and sql server, since last 2 days).
I have the follwing code in a c# aspx file:
 
<%string domain = (HttpContext.Current.Request.ServerVariables["HTTP_HOST"]);%>
 
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:testfirststring %>" 
        SelectCommand="SELECT testField FROM table1test WHERE testField = '<% domain %>' "></asp:SqlDataSource>
 
I am missing something to have the domain variable to be accessible in the where statement.
 
Everything else works (for now)!  :)

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ThanksWelcomeAsked:
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crazymanCommented:
just override OnPreRender and add the following :

protected override void OnPreRender(EventArgs e)
{
         this.SqlDataSource1.SelectCommand = String.Format("SELECT testField FROM table1test WHERE testField ='{0}'",HttpContext.Current.Request.ServerVariables["HTTP_HOST"]);
}
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ThanksWelcomeAuthor Commented:
Hi, thanks for your help.

Unfortunately, being a newbie, I have absolutery no clue of how to override OnPreRender as you ask.

Also, I do not know where to add the code you provided.

Thanks for more details!

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crazymanCommented:
Just place it in the code behind, or even inside.

<script runat="server" type="text/C#">
</script>
Then dont set you SelectCommand on your SqlDataSource in the markup..
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ThanksWelcomeAuthor Commented:
Woooohooo!!!  It works!  So happy, thank's!  (I'm do not understanding why, though, because I do not understand what do this function. Any extra thought? For example, what is the purpuse of the {0}? )  Thank's!
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Microsoft SQL Server 2005

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