Checking whether the PC is connected on LAN or not

Question

I want to ask 2 questions and I would be thankful if somebody can reply.

1. How can I check (using C#) whether the PC is connected to LAN or not?

2. How can I check (using C#) my PC is connected on LAN or not

Answer 1

Try

System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()

Answer 2

You want to use Ping to check whether a PC is connected to the LAN. Here's a sample:

var ping = new Ping();
var options = new PingOptions { DontFragment = true };

//just need some data. this sends 10 bytes.
var buffer = Encoding.ASCII.GetBytes( new string( 'z', 10 ) );
var host = "127.0.0.1";

try
{
    var reply = ping.Send( host, 60, buffer, options );
    if ( reply == null )
    {
        MessageBox.Show( "Reply was null" );
        return;
    }

    if ( reply.Status == IPStatus.Success )
    {
        MessageBox.Show( "Ping was successful." );
    }
    else
    {
        MessageBox.Show( "Ping failed." );
    }
}
catch ( Exception ex )
{
    MessageBox.Show( ex.Message );
}

To check if you own machine was connected, you could do the same to an address you know should resolve like say the domain controller.