How can I get the IP of my PC?

ipconfig

/**
 * This function retrieves the list of available IP on this computer.
 * Usefull only for computer with several network cards
 * note that 127.0.0.1 is not listed.
 */
list<string> GetIpList()
{
    list<string> ret;
    char name[1024];
    hostent *ips;
    /* get name of computer */
    if(0 == gethostname(name, sizeof name)) {
        /* retreive IP addresses*/
        ips = gethostbyname(name);
        if(NULL != ips) {
            int i;
            for (i = 0; ips->h_addr_list[i] != 0; ++i) {
                 in_addr addr;
                memcpy(&addr, ips->h_addr_list[i], sizeof(struct in_addr));
                ret.push_back(inet_ntoa(addr));
            }
        }
    }
    return ret;
}

System.Net.IPAddress[] addresses = System.Net.Dns.GetHostAddresses(System.Net.Dns.GetHostName());
// optional: create a list of string to display addresses in the usual ways
// ipv4 : 192.168.1.1 or ipv6 : fd50:5829:2f2c:7ab:ef78%20
List<string> ips = new List<string>();
foreach (System.Net.IPAddress addr in addresses)
{
   ips.Add(addr.ToString());
}