This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
"Rajesh", we don't have many rules around here but our naming policy is one of them. Not complying with the policy will lead to your account becoming locked. This warning hopefully will prevent that from happening, but some action is required on your part.
Please review the policy here and you can change your Publicly Displayed Name here.