How do I check Network Status?

I want to include a process to check if the network communication is functioning properly upon startup. How can I do this? (Airplane mode, out of coverage)

Is there any good way..?

There is no reliable way to detect if the user is definitely online or definitely offline. They could have an intermittent connection, or the status could change just after you check it. The only good way to do this is: don't check for connectivity, just attempt network operations, and handle them if they fail.