Redirecting and hiding URL

Problem : I wanted to make a link that will redirect the users to download a pdf file. Yet, I have to hide the URL, and can't let the users know the URL to the file.

Solution : I use repeater to hide the URL by using CommandArgument and CommandName attributes.

I make a repeater which looks more or less like this on the aspx:

<asp:repeater id="rpt" runat="server" onitemcommand="rpt_ItemCommand" onitemdatabound="rpt_ItemDataBound">
    <itemtemplate>
        <asp:linkbutton id="linkFileName" runat="server" cssclass="link3"></asp:linkbutton>
    </itemtemplate>
</asp:repeater>

Then on the CS:

protected void rpt_ItemDataBound(object sender, RepeaterItemEventArgs e)
 {
     if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
     {
         ClassData classData = (classData)e.Item.DataItem;
         LinkButton linkFileName = (LinkButton)e.Item.FindControl("linkFileName");
         string fileName = classData.FileName;
         linkFileName.Text = fileName;
         linkFileName.CommandArgument = classData.FileName;
     }
 }


protected void rpt_ItemCommand(object source, RepeaterCommandEventArgs e)
 {
     if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
     {
         Response.Clear();
         Response.ContentType = "application/octet-stream";
         Response.AddHeader("Content-Disposition", "attachment; filename=" + e.CommandArgument);
         Response.Flush();
         Response.WriteFile("D:\folder\" + e.CommandArgument);
         Response.End();
     }
 }