gibu: that makes sense and confirms what I had come to suspect. It seems that compiling the ethernet driver for your device modifies the wireless stack in such a way that it makes the Broadcom wireless driver incompatible. Unfortunately Broadcom's driver can be picky about what it needs to work, and since it's maintained by Broadcom rather than open-source developers, it's hard to fix these problems.
I'm thinking it may still be possible for you to get your wireless and ethernet working at the same time by using ndiswrapper for the wireless. ndiswrapper would drive your card using Windows drivers rather than Broadcom's driver, and it should work even with your modified wireless stack. If you want to give this a try, I'll try to write up instructions if you can point me to a Windows driver for your wireless card, and tell me whether you're using a 32 or 64-bit Linux kernel (if you aren't sure, post the output of "uname -m").
Of course, if you'd prefer simply to stick with 8.10 at this point, that's completely fine, so don't feel any pressure to try ndiswrapper unless you want to.
Rajeshtl: the commands you ran installed an ethernet driver for a device that you don't have. I assume you want to get your wireless working; to do that, it should be sufficient to do:
You may also need to run this command to undo the changes you made before:
sudo apt-get update
sudo apt-get install bcmwl-kernel-source bcmwl-modaliases
echo wl | sudo tee -a /etc/modules
If this still doesn't make your wireless work after a reboot, please post the output of:
sudo make uninstall
dmesg | grep -e wl -e eth1 -e disagree
lshw -C Network