1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Threading.Tasks; 9 using System.Windows.Forms;10 using System.Net;11 12 namespace WindowsFormsApplication113 {14     public partial class Form1 : Form15     {16         public Form1()17         {18             InitializeComponent();19         }20 21         private void button1_Click(object sender, EventArgs e)22         {23             textBox2.Text = string.Empty;24             IPAddress[] ips = Dns.GetHostAddresses(textBox1.Text);25             foreach (IPAddress ip in ips)26             {27                 textBox2.Text = ip.ToString();28             }29             textBox3.Text = Dns.GetHostName();30             textBox4.Text = Dns.GetHostByName(Dns.GetHostName()).HostName;31         }32     }33 }