How to know if the local Area Connection is available

Question

I'm using Windows XP and I want to know if the local area is available or not?

And if I'm using another OS would that affect on my code?

Answer 1

Use the following code

using System.Net.NetworkInformation; //(Add reference of System.Net.dll)
public partial class Form1: Form
{
    public Form1()
    {
        InitializeComponent();
        NetworkChange.NetworkAvailabilityChanged += NetworkChange_NetworkAvailabilityChanged;
    }
    private void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
    {
        if(e.IsAvailable)
        {
            //connected
        }
        else
        {
            //disconnected
        }
    }
}

Answer 2

The source code for ToggleNic shows you how to enable, disable or check for available network connections on windows. This is in C#.

Answer 3

Here's how to do it in Delphi.