Detect IP Address(WPF)

Hi,
I want to detect IP address from user's computer after button click. So, it will show out the IP address on a textbox. How should i write my code?
Thx a lots!

Use System.Net namespace.
private void button1_Click(object sender, RoutedEventArgs e)
{
IPHostEntry hostEntry = Dns.GetHostEntry(Dns.GetHostName());
IPAddress[] address = hostEntry.AddressList;
textBox1.Text = address.GetValue(1).ToString();
//MessageBox.Show(address.GetValue(1).ToString());
}
Hope this helps you.

I need code of IP Address of my computer to show it
 
^_^