C# - Response.end Method Causing Session Variable To Expire?

I am storing the returned sql resultant rows in a session variable ... so that I need not to query again and again

Session["ds"] = datasetname;

Everything is fine but when I am doing export to excel ... where at last after the export is completed I am calling the method in try/catch

try {
Response.End()
}
catch {}

But due to this, my session variable (ds) is getting expired and when I am using it next there is no rows and hence my page displays no data.

I tried going through internet and found that this is a bug it seems as identified by Microsoft and they have provided a hotfix for this but in Windows Vista .... I am running on XP.

[URL]

Is there any other workaround to this problem?