Passing a Guid to SQL code within Asp.Net - sql

Question

This SQL code is in the Asp.Net code itself so how can I set the WHERE to equal the Guid which I have passed over in the requestQuery String?
E.g I want to put something like WHERE tblEntrants.compID = Request.QueryString("Comp") but obviously I can't. The Guid in the QueryString need passing in to this SQL query somehow. I'm fairly new to all this so if anyone can help I would much appreciate it.
<asp:SqlDataSource ID="DSEntrants" runat="server" ConnectionString="<%$ ConnectionStrings:DBConnectionString %>" SelectCommand="SELECT tblEntrants.accountID, tblEntrants.compID, tblaccounts.accountID, tblaccounts.contactName, tblEntrants.paid
FROM tblAccounts INNER JOIN
tblEntrants ON tblAccounts.accountID = tblEntrants.accountID
WHERE tblEntrants.compID = ?????????????????
ORDER BY tblEntrants.accountID DESC"></asp:SqlDataSource>

Answer 1

I have just worked out how to do this. You can directly set a querystring parameter like this..
<asp:SqlDataSource ID="DSEntrants" runat="server" ConnectionString="<%$ ConnectionStrings:DBConnectionString %>" SelectCommand="SELECT tblEntrants.accountID, tblEntrants.compID, tblaccounts.accountID, tblaccounts.contactName, tblaccounts.skypeUserName, tblEntrants.paid
FROM tblAccounts INNER JOIN
tblEntrants ON tblAccounts.accountID = tblEntrants.accountID
WHERE tblEntrants.compID = #Event_ID
ORDER BY tblEntrants.accountID DESC">
<SelectParameters>
<asp:QueryStringParameter QueryStringField="compID" Name="Event_ID" />
</SelectParameters>
All works fine, thanks for reading.