C#-自动获取IP

//自动获取ip
rip是个下拉列表
public void GetIp()
{
try
{
string strHostName = Dns.GetHostName();  //得到本机的主机名
IPHostEntry ipEntry = Dns.GetHostByName(strHostName); //取得本机IP
string strAddr = ipEntry.AddressList[0].ToString();
rip.Text = strAddr;
rip.Items.Clear();
for (int i = 0; i < 10; i++)
{
strAddr = ipEntry.AddressList[i].ToString();
rip.Items.Add(strAddr);
}

}
catch{}
}