I tried to convert my dataset into excel and download that excel .I got my required excel file.But System.Threading.ThreadAbortException was raised every excel download. Ho
I used all above changes but still I was getting same issue on my web application.
Then I contacted my hosting provide & asked them to check if any software or antivirus blocking our files to transfer via HTTP. or ISP/network is not allowing file to transfer.
They checked server settings & bypass the "Data Center Shared Firewall" for my server & now our application is able to download the file.
Hope this answer will help someone.This is what worked for me