getting a value from user control - asp.net

Question

I have an issue that i believe there is a simple solution for but being new to ASP.NET it is not very clear to me.
I have a user control that has a for loop that makes bunch of hyperlink elements in a list (looks like below>
<li><a href="blahblah.aspx?ID=1..../></li>
<li><a href="blahblah.aspx?ID=2..../></li>
<li><a href="blahblah.aspx?ID=3..../></li>
<li><a href="blahblah.aspx?ID=4..../></li>
Next, that uc is used in another page with in a <form> tag with method="post" and <asp:button> that isn't really used.
Next, when one of the links is clicked it will go to blahblah.asp and get the ID in there via Request.QueryString
So far so good.
What i want to do though (and the reason for this post) is that i want to not use ID as a query parameter. I want to pass the ID in the body. So the link would be blahblah.aspx and it wouldn't show the ID.
What would be the best way to accomplish this. I've tried couple different ways but it's not working.

Answer 1

Not sure if this will work for you, but instead of using html a tags, use the asp LinkButton control. You can then handle the command event of this control so have your for loop generate the following controls (or better yet use a repeater):
<asp:LinkButton id="button1" runat="server" CommandArgument="1" OnCommand="SendToBlah" />
<asp:LinkButton id="button2" runat="server" CommandArgument="2" OnCommand="SendToBlah" />
private void SendToBlah(Object sender, CommandEventArgs e)
{
Session["ID"] = e.CommandArgument;
Response.Redirect("blahblah.aspx");
}
You can then use your session argument inside your blahblah.aspx page however you see fit.

Answer 2

To send the data in the HTTP body instead of the query string, you need to do an HTTP post. This is easy enough, just use a form with a hidden parameter:
<li>
<form action="blahblah.aspx" method="post">
<input type="hidden" name="ID" value="1" />
<input type="submit" value="submit" />
</form>
</li>
To get the data on the target page, use Request.Params instead of QueryString.
Now, if you want to use a hyperlink rather than a "submit" button, you can always submit the form using Javascript:
<li>
<form id="myform1" action="blahblah.aspx" method="post">
<input type="hidden" name="ID" value="1" />
</form>
Submit the form
<form id="myform2" action="blahblah.aspx" method="post">
<input type="hidden" name="ID" value="1" />
</form>
Submit the form
</li>
<script type='text/javascript'>
window.submitForm = function(id) {
document.forms[id].submit();
return false;
}
</script>