How to test if a proxy server is working or not?

Question

I\'ve got a pretty big list with proxy servers and their corresponding ports. How can I check, if they are working or not?

Answer 1

try this:

public static bool SoketConnect(string host, int port)
{
    var is_success = false;
    try
    {
        var connsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        connsock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 200);
        System.Threading.Thread.Sleep(500);
        var hip = IPAddress.Parse(host);
        var ipep = new IPEndPoint(hip, port);
        connsock.Connect(ipep);
        if (connsock.Connected)
        {
            is_success = true;
        }
        connsock.Close();
    }
    catch (Exception)
    {
        is_success = false;
    }
    return is_success;
}