The below code works fine for downloading a file from a current pc.plz suggest me how to download it from remote server using ip address or any method

protected void Button1_Click(object sender, EventArgs e)
{
    const string fName = @"C:\ITFSPDFbills\February\AA.pdf";
    FileInfo fi = new FileInfo(fName);
    long sz = fi.Length;

    Response.ClearContent();
    Response.ContentType = MimeType(Path.GetExtension(fName));
    Response.AddHeader("Content-Disposition", string.Format("attachment; filename = {0}", System.IO.Path.GetFileName(fName)));
    Response.AddHeader("Content-Length", sz.ToString("F0"));
    Response.TransmitFile(fName);
    Response.End();
}

public static string MimeType(string Extension)
{
    string mime = "application/octetstream";
    if (string.IsNullOrEmpty(Extension))
        return mime;

    string ext = Extension.ToLower();
    Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
    if (rk != null && rk.GetValue("Content Type") != null)
        mime = rk.GetValue("Content Type").ToString();
    return mime;
}