SaveAs excel Dialog and IIS ConnectionTimeOut

[N. Shehzad]

Experts:
I have a following code that allows a user to download excel file. However
if the download dialog has been sitting there for more than two minutes which
is connectiontimeout setting on IIS, user cannot download the file, and it
results in error. How can I keep the connection open, so that if users goes
for restroom break, and meanwhile the popup saveAs dialog has shown up
without changing the connectionTimeOut property on the IIS server?

//request was not aborted
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("Content-Disposition", "attachment;
filename=" + _fileDisplayName);
Response.Charset = "";
if (System.IO.File.Exists(Server.MapPath(".") + "\\" +
_xlFileName))
Response.TransmitFile(Server.MapPath(".") + "\\" +
_xlFileName);
Response.Flush();