For whatever reason when I use Response.Redirect the window just closes out instead of navigating to the given URL, here is the code.

```
    if (mode == "print")
    {
        error_code.Text = "";
        //thumb.Src = file_loc + "source/" + "certificate_thumbnail.jpeg";
        link.HRef = "Certificates/" + u_name + ".pdf";
        link.Visible = true;
        Response.Redirect("http://xx.xxxxxxxxxxxxx.xx.gov/cert/Certificates/" + u_name + ".pdf");

    }

```

(I removed the url for security purposes given who my client is...)