What is the best way to check for Internet connectivity using .NET?

Question

What is the fastest and most efficient way to check for Internet connectivity in .NET?

Answer 1

You can use NetworkInterface.GetIsNetworkAvailable method which indicates whether any network connection is available.

Try this:

bool connection = NetworkInterface.GetIsNetworkAvailable();
if (connection == true)
 {
     MessageBox.Show("The system is online");
 }
 else {
     MessageBox.Show("The system is offline";
 }