using System.Net;
IPHostEntry localHostEntry = Dns.GetHostByName(Dns.GetHostName());
            for(int i=0;i<localHostEntry.AddressList.Length;i++)
            {
                cmbIP.Items.Add(localHostEntry.AddressList[i].ToString()); //把本机所有网卡(如：双网卡)的IP地址列出来
            }