string strHostName ="bbs.bc-cn.net";
IPHostEntry ipEntry = Dns.GetHostByName(strHostName);
IPAddress[] addr = ipEntry.AddressList;

for (int i = 0; i < addr.Length; i++)
{
ServerIP = IPAddress.Parse(addr[i].ToString());
}
MessageBox.Show("bbs.bc-cn.net IP:"+ServerIP);

222.43.120.75